REFERENCES
1. Nunes, L. J. R. The rising threat of atmospheric CO2: a review on the causes, impacts, and mitigation strategies. Environments 2023, 10, 66.
2. Chenxiao, Y.; Xiaoguang, Y.; Jiantao, M.; Sijin, L. A systematic review of urban road traffic CO2 emission models. Carbon. Footprints. 2025, 4, 17.
3. Rothenberg, G. A realistic look at CO2 emissions, climate change and the role of sustainable chemistry. Sustain. Chem. Climate. Action. 2023, 2, 100012.
4. Rui, W.; Yuzhong, Z.; Shuang, Z.; Xinlu, W. Open-data-based city-scale gridded carbon dioxide emission inventory: supporting urban carbon monitoring in Chengdu, China. Carbon. Footprints. 2024, 3, 14.
5. Li, G.; Yao, J. A review of algae-based carbon capture, utilization, and storage (Algae-Based CCUS). Gases 2024, 4, 468-503.
6. Wan Osman, W. N. A.; Rosli, M. H.; Mazli, W. N. A.; Samsuri, S. Comparative review of biodiesel production and purification. Carbon. Capture. Sci. Technol. 2024, 13, 100264.
7. Suhara, A.; Karyadi, .; Herawan, S. G.; et al. Biodiesel sustainability: review of progress and challenges of biodiesel as sustainable biofuel. Clean. Technol. 2024, 6, 886-906.
8. Naseef, H. H.; Tulaimat, R. H. Transesterification and esterification for biodiesel production: a comprehensive review of catalysts and palm oil feedstocks. Energy. Convers. Manag. X. 2025, 26, 100931.
9. Yusuf, B. O.; Oladepo, S. A.; Ganiyu, S. A. Efficient and sustainable biodiesel production via transesterification: catalysts and operating conditions. Catalysts 2024, 14, 581.
10. Gaide, I.; Grigas, A.; Makareviciene, V.; Sendzikiene, E. Life cycle assessment and biodegradability of biodiesel produced using different alcohols and heterogeneous catalysts. Green. Chem. Lett. Rev. 2024, 17, 2394503.
11. Nogales-Delgado, S. Biodiesel production and life cycle assessment: status and prospects. Energies 2025, 18, 3338.
12. Christopher, Selvam. D.; Raja, T.; Nagappan, B.; et al. The role of biodiesel in marine decarbonization: Technological innovations and ocean engineering challenges. Results. Eng. 2025, 25, 103974.
13. K, N. K.; Akash, Deep. B. N.; Birur, Jayanna. V.; et al. Influence of ceramic thermal barrier coating on diesel engine performance using scum oil biodiesel at different compression ratios. Sci. Rep. 2025, 15, 31094.
14. Shanthini, V.; Chitra, D.; Moorthy, G. Biodiesel: a comprehensive review of properties, catalyst types, and feedstock sources. Results. Chem. 2025, 18, 102678.
15. Zheng, F.; Cho, H. M. Study on biodiesel production: feedstock evolution, catalyst selection, and influencing factors analysis. Energies 2025, 18, 2533.
16. Debnath, D.; Whistance, J.; Thompson, W. The U.S. biodiesel outlook: a pathway toward sustainability. Sustainability 2025, 17, 689.
17. Mhetras, N.; Gokhale, D. Sustainable biodiesel production: importance of feedstock resources and production methods. RSC. Adv. 2025, 15, 26739-54.
18. Abdelrahman, A. A.; Abo, El-khair. M. A. Advanced biodiesel production: feedstocks, technologies, catalysts, challenges, and environmental impacts. J. Environ. Chem. Eng. 2025, 13, 114966.
19. Boichenko, S.; Yakovlieva, A.; Zubenko, S.; Shkilniuk, I. Physical, chemical, and performance properties of biodiesel fuels: a comparative study of lipid-based feedstocks. Energies 2025, 18, 4274.
20. Anil, N.; Rao, P. K.; Sarkar, A.; et al. Advancements in sustainable biodiesel production: A comprehensive review of bio-waste derived catalysts. Energy. Convers. Manag. 2024, 318, 118884.
21. El-Araby, R. Biofuel production: exploring renewable energy solutions for a greener future. Biotechnol. Biofuels. Bioprod. 2024, 17, 129.
22. Mandari, V.; Devarai, S. K. Biodiesel production using homogeneous, heterogeneous, and enzyme catalysts via transesterification and esterification reactions: a critical review. Bioenergy. Res. 2022, 15, 935-61.
23. Wang, B.; Wang, B.; Shukla, S. K.; Wang, R. Enabling catalysts for biodiesel production via transesterification. Catalysts 2023, 13, 740.
24. Wang, H.; Zhou, H.; Yan, Q.; Wu, X.; Zhang, H. Superparamagnetic nanospheres with efficient bifunctional acidic sites enable sustainable production of biodiesel from budget non-edible oils. Energy. Convers. Manag. 2023, 297, 117758.
25. Mohiddin, M. N. B.; Tan, Y. H.; Seow, Y. X.; et al. Evaluation on feedstock, technologies, catalyst and reactor for sustainable biodiesel production: a review. J. Ind. Eng. Chem. 2021, 98, 60-81.
26. Nabgan, W.; Jalil, A. A.; Nabgan, B.; et al. Sustainable biodiesel generation through catalytic transesterification of waste sources: a literature review and bibliometric survey. RSC. Adv. 2022, 12, 1604-27.
27. Kibar, M. E.; Hilal, L.; Çapa, B. T.; Bahçıvanlar, B.; Abdeljelil, B. B. Assessment of homogeneous and heterogeneous catalysts in transesterification reaction: a mini review. ChemBioEng. Reviews. 2023, 10, 412-22.
28. Kawashima, A.; Matsubara, K.; Honda, K. Development of heterogeneous base catalysts for biodiesel production. Bioresour. Technol. 2008, 99, 3439-43.
29. He, L.; Zhang, L. L.; Zhou, H.; et al. Boosting photocatalytic upcycling of liquid biomass into biodiesel via microenvironment modulation. Adv. Energy. Mater. 2024, 15, 2403168.
30. He, L.; Chen, L.; Nie, Y.; et al. A practical approach for enhanced biodiesel production using organic modified montmorillonites as efficient heterogeneous hybrid catalysts. Green. Chem. 2024, 26, 5954-65.
31. Changmai, B.; Vanlalveni, C.; Ingle, A. P.; Bhagat, R.; Rokhum, S. L. Widely used catalysts in biodiesel production: a review. RSC. Adv. 2020, 10, 41625-79.
32. Basumatary, S. F.; Brahma, S.; Hoque, M.; et al. Advances in CaO-based catalysts for sustainable biodiesel synthesis. Green. Energy. Resour. 2023, 1, 100032.
33. Zul, N. A.; Ganesan, S.; Hamidon, T. S.; Oh, W.; Hussin, M. H. A review on the utilization of calcium oxide as a base catalyst in biodiesel production. J. Environ. Chem. Eng. 2021, 9, 105741.
34. Macheli, L.; Malefane, M. E.; Jewell, L. L. Waste-derived calcium oxide catalysts in biodiesel production: exploring various waste sources, deactivation challenges, and improvement strategies. Bioresour. Technol. Rep. 2025, 29, 102021.
35. Ooi, H. K.; Koh, X. N.; Ong, H. C.; et al. Progress on modified calcium oxide derived waste-shell catalysts for biodiesel production. Catalysts 2021, 11, 194.
36. Liu, X.; Xing, S.; Yang, L.; et al. Highly active and durable Ca-based solid base catalyst for biodiesel production. Fuel 2021, 302, 121094.
37. Granados, M. L.; Alonso, D. M.; Sádaba, I.; Mariscal, R.; Ocón, P. Leaching and homogeneous contribution in liquid phase reaction catalysed by solids: the case of triglycerides methanolysis using CaO. Appl. Catal. B. Environ. 2009, 89, 265-72.
38. Ghosh, N.; Khan, A. M.; Halder, G. Advances in calcium oxide mediated catalytic biodiesel production: a paradigm shift in complying with UN's SDG7. Appl. Energy. 2025, 391, 125954.
39. Mazaheri, H.; Ong, H. C.; Amini, Z.; et al. An overview of biodiesel production via calcium oxide based catalysts: current state and perspective. Energies 2021, 14, 3950.
40. Sulaiman, N. F.; Ramly, N. I.; Abd, Mubin. M. H.; Lee, S. L. Transition metal oxide (NiO, CuO, ZnO)-doped calcium oxide catalysts derived from eggshells for the transesterification of refined waste cooking oil. RSC. Adv. 2021, 11, 21781-95.
41. Wang, Y.; Li, D.; Zhao, D.; et al. Calcium-loaded municipal sludge-biochar as an efficient and stable catalyst for biodiesel production from vegetable oil. ACS. Omega. 2020, 5, 17471-8.
42. Arenas-quevedo, M. G.; Manríquez, M. E.; Wang, J. A.; et al. ZnO-doped CaO binary core-shell catalysts for biodiesel production via mexican palm oil transesterification. Inorganics 2024, 12, 51.
43. Teo, C. K.; Chia, P. W.; Nordin, N.; et al. Calcium oxide waste-based catalysts for biodiesel production and depollution: a review. Environ. Chem. Lett. 2024, 22, 1741-58.
44. Parida, S.; Singh, M.; Pradhan, S. Biomass wastes: a potential catalyst source for biodiesel production. Bioresour. Technol. Rep. 2022, 18, 101081.
45. Chandra, Kishore. S.; Perumal, S.; Atchudan, R.; et al. A review of biomass-derived heterogeneous catalysts for biodiesel production. Catalysts 2022, 12, 1501.
46. Shan, R.; Zhao, C.; Lv, P.; Yuan, H.; Yao, J. Catalytic applications of calcium rich waste materials for biodiesel: current state and perspectives. Energy. Convers. Manag. 2016, 127, 273-83.
47. Ao, S.; Changmai, B.; Vanlalveni, C.; Chhandama, M. V. L.; Wheatley, A. E.; Rokhum, S. L. Biomass waste-derived catalysts for biodiesel production: Recent advances and key challenges. Renew. Energy. 2024, 223, 120031.
48. Amal, R.; Nizamuddin, S. Towards sustainable biodiesel production: efficient utilization of animal fat wastes and shell-derived catalysts. Environ. Sci. Pollut. Res. Int. 2025, 32, 14383-404.
49. Makarevičienė, V.; Gaidė, I.; Sendžikienė, E. Heterogeneous catalysts from food waste for biodiesel synthesis - a comprehensive review. Catalysts 2025, 15, 957.
50. Amal, R.; Usman, M. A review of breakthroughs in biodiesel production with transition and non-transition metal-doped CaO nano-catalysts. Biomass. Bioenergy. 2024, 184, 107158.
51. Melo, V. M. E.; Ferreira, G. F.; Fregolente, L. V. Sustainable catalysts for biodiesel production: the potential of CaO supported on sugarcane bagasse biochar. Renew. Sustain. Energy. Rev. 2024, 189, 114042.
52. Boey, P.; Maniam, G. P.; Hamid, S. A. Performance of calcium oxide as a heterogeneous catalyst in biodiesel production: a review. Chem. Eng. J. 2011, 168, 15-22.
53. Gholami, A.; Pourfayaz, F.; Rodygin, K. Reusable chemical catalysts for sustainable biodiesel production: the role of metallic elements. ChemBioEng. Rev. 2025, 12, e202400033.
54. Oueda, N.; Bonzi-coulibaly, Y. L.; Ouédraogo, I. W. K. Deactivation processes, regeneration conditions and reusability performance of CaO or MgO based catalysts used for biodiesel production - a review. Mater. Sci. Appl. 2017, 08, 94-122.
55. Kouzu, M.; Hidaka, J. Transesterification of vegetable oil into biodiesel catalyzed by CaO: a review. Fuel 2012, 93, 1-12.
56. Tigro, A. A.; Hailegiorgis, S. M.; Reshad, A. S. Heterogeneous alkaline calcium oxide nano-catalyst supported on porous materials for the transesterification reaction: a review. Results. Eng. 2025, 27, 105912.
57. Song, C.; Kazemi, M. Based on magnetically recoverable catalysts: a green strategy to sulfonamides. Mol. Divers. 2025, 29, 5045-74.
58. Rodriguez, Y.; Ponce, S.; Keller, M. H.; et al. Calcium-based catalyst prepared in the presence of biopolymer/biomass for biodiesel production: Elucidating their influence on the catalytic efficiency. Biomass. Bioenergy. 2024, 186, 107268.
59. Rahman, W. U.; Khan, R. I. A.; Ahmad, S.; et al. Valorizing waste palm oil towards biodiesel production using calcareous eggshell based heterogeneous catalyst. Bioresour. Technol. Rep. 2023, 23, 101584.
60. Ulakpa, W. C.; Aseibichin, C.; Chimezie, O. A.; et al. Nano-CaO as a heterogeneous catalyst for biodiesel synthesis by transesterification of Jatropha oil. J. Trace. Elem. Miner. 2024, 9, 100183.
61. Garg, R.; Garg, R.; Eddy, N. O.; Abdulraheem, M. I.; Hazzan, O. O.; Abdi, G. Green synthesis of calcium oxide nanocatalyst and application in transesterification of waste cooking oil. Bioresour. Bioprocess. 2025, 12, 52.
62. Kouider, Elouahed. S.; Asikin-Mijan, N.; Kaddour, O.; et al. Efficient biodiesel production from soybean oil using calcium oxide supported bimetallic molybdenum-zinc catalysts. Int. J. Green. Energy. 2025, 22, 3670-86.
63. Ho, W. W. S.; Ng, H. K.; Gan, S. Biodiesel synthesis from refined palm oil using a calcium oxide impregnated ash-based catalyst: parametric, kinetics, and product characterization studies. Catalysts 2022, 12, 706.
64. Kouzu, M.; Tsunomori, M.; Yamanaka, S.; Hidaka, J. Solid base catalysis of calcium oxide for a reaction to convert vegetable oil into biodiesel. Adv. Powder. Technol. 2010, 21, 488-94.
65. Ahmed, M.; Ahmad, K. A.; Vo, D. N.; et al. Recent trends in sustainable biodiesel production using heterogeneous nanocatalysts: Function of supports, promoters, synthesis techniques, reaction mechanism, and kinetics and thermodynamic studies. Energy. Convers. Manag. 2023, 280, 116821.
66. Kouzu, M.; Kasuno, T.; Tajika, M.; Sugimoto, Y.; Yamanaka, S.; Hidaka, J. Calcium oxide as a solid base catalyst for transesterification of soybean oil and its application to biodiesel production. Fuel 2008, 87, 2798-806.
67. Hu, S.; Wang, Y.; Han, H. Utilization of waste freshwater mussel shell as an economic catalyst for biodiesel production. Biomass. Bioenergy. 2011, 35, 3627-35.
68. Sharifi, M.; Tangestaninejad, S.; Moghadam, M.; et al. Metal-organic frameworks-derived CaO/ZnO composites as stable catalysts for biodiesel production from soybean oil at room temperature. Sci. Rep. 2025, 15, 3610.
69. Ahmad, Khan. R. I.; Ghosh, N.; Khan, A. R.; et al. Unlocking the efficacy of eggshell-derived CaO@TiO2 nanocatalyst for intensified green biodiesel production. J. Ind. Eng. Chem. 2026, 153, 355-69.
70. Weldeslase, M. G.; Benti, N. E.; Desta, M. A.; Mekonnen, Y. S. Maximizing biodiesel production from waste cooking oil with lime-based zinc-doped CaO using response surface methodology. Sci. Rep. 2023, 13, 4430.
71. Olvera, D.; Rodriguez, J. A.; Perez-Silva, I.; Chavez-Esquivel, G.; Tavizón-Pozos, J. A. Catalytic evaluation of Li and K supported on CaO in the transesterification of triolein, triestearin, and tributyrin. Chem. Pap. 2022, 76, 6287-95.
72. Li, X.; Zhang, S.; Jia, X.; Li, W.; Song, J. Catalytic properties and structural optimization of solid transesterification catalysts to enhance the efficiency of biodiesel synthesis. Catalysts 2025, 15, 239.
73. Catarino, M.; Martins, S.; Soares, Dias. A. P.; Costa, Pereira. M. F.; Gomes, J. Calcium diglyceroxide as a catalyst for biodiesel production. J. Environ. Chem. Eng. 2019, 7, 103099.
74. Kouzu, M.; Yamanaka, S.; Hidaka, J.; Tsunomori, M. Heterogeneous catalysis of calcium oxide used for transesterification of soybean oil with refluxing methanol. Appl. Catal. A. Gen. 2009, 355, 94-9.
75. Sharma, S.; Saxena, V.; Baranwal, A.; Chandra, P.; Pandey, L. M. Engineered nanoporous materials mediated heterogeneous catalysts and their implications in biodiesel production. Mater. Sci. Energy. Technol. 2018, 1, 11-21.
76. Wang, S.; Fu, H.; Abulizi, A.; et al. Biodiesel production from sheep fat catalyzed by CaO-SrOx/BCsy acid-base bifunctional catalyst and process optimization. Renew. Energy. 2025, 238, 121881.
77. Lee, H.; Juan, J.; Taufiq-Yap, Y. Preparation and application of binary acid-base CaO-La2O3 catalyst for biodiesel production. Renew. Energy. 2015, 74, 124-32.
78. Enguilo Gonzaga, V.; Romero, R.; Romero, A.; Martínez, S. L.; Natividad, R. Biodiesel production from waste cooking oil catalyzed by a bifunctional catalyst. ACS. Omega. 2021, 6, 24092-105.
79. Zhang, Z.; Meng, P.; Luo, H.; Pei, Z.; Liu, X. Lewis acid-base site-assisted in situ transesterification catalysis to produce biodiesel. Catalysts 2024, 14, 731.
80. Mulyatun, M.; Prameswari, J.; Istadi, I.; Widayat, W. Synthesis method effect on the catalytic performance of acid-base bifunctional catalysts for converting low-quality waste cooking oil to biodiesel. Catal. Lett. 2024, 154, 4837-55.
81. Vishnulal, K.; Ramadesigan, V.; Seethamraju, S. Biodiesel synthesis using spent FCC catalyst and CaO from a mixture of sunflower oil and oleic acid. Bioresour. Technol. Rep. 2024, 25, 101714.
82. Ali, B.; Yusup, S.; Quitain, A. T.; Alnarabiji, M. S.; Kamil, R. N. M.; Kida, T. Synthesis of novel graphene oxide/bentonite bi-functional heterogeneous catalyst for one-pot esterification and transesterification reactions. Energy. Convers. Manag. 2018, 171, 1801-12.
83. Niju, S.; Meera, Sheriffa. Begum. K.; Anantharaman, N. Enhancement of biodiesel synthesis over highly active CaO derived from natural white bivalve clam shell. Arab. J. Chem. 2016, 9, 633-9.
84. Rezaei, R.; Mohadesi, M.; Moradi, G. Optimization of biodiesel production using waste mussel shell catalyst. Fuel 2013, 109, 534-41.
85. Boey, P.; Maniam, G. P.; Hamid, S. A.; Ali, D. M. H. Utilization of waste cockle shell (Anadara granosa) in biodiesel production from palm olein: optimization using response surface methodology. Fuel 2011, 90, 2353-8.
86. Nair, P.; Singh, B.; Upadhyay, S.; Sharma, Y. Synthesis of biodiesel from low FFA waste frying oil using calcium oxide derived from Mereterix mereterix as a heterogeneous catalyst. J. Clean. Prod. 2012, 29-30, 82-90.
87. Buasri, A.; Loryuenyong, V. The new green catalysts derived from waste razor and surf clam shells for biodiesel production in a continuous reactor. Green. Process. Synth. 2015, 4, 389-97.
88. Buasri, A.; Rattanapan, T.; Boonrin, C.; Wechayan, C.; Loryuenyong, V. Oyster and Pyramidella shells as heterogeneous catalysts for the microwave-assisted biodiesel production from Jatropha curcas oil. J. Chem. 2015, 2015, 578625.
89. Maruyama, H.; Seki, H. Esterification of tripalmitin using calcined scallop shell as a heterogeneous basic catalyst. Asia-Pac. J. Chem. Eng. 2022, 18, e2870.
90. Nahas, L.; Dahdah, E.; Aouad, S.; et al. Highly efficient scallop seashell-derived catalyst for biodiesel production from sunflower and waste cooking oils: Reaction kinetics and effect of calcination temperature studies. Renew. Energy. 2023, 202, 1086-95.
91. Sirisomboonchai, S.; Abuduwayiti, M.; Guan, G.; et al. Biodiesel production from waste cooking oil using calcined scallop shell as catalyst. Energy. Convers. Manag. 2015, 95, 242-7.
92. Panjaitan, F. R.; Yamanaka, S.; Kuga, Y. Soybean oil methanolysis over scallop shell-derived CaO prepared via methanol-assisted dry nano-grinding. Adv. Powder. Technol. 2017, 28, 1627-35.
93. Kouzu, M.; Kajita, A.; Fujimori, A. Catalytic activity of calcined scallop shell for rapeseed oil transesterification to produce biodiesel. Fuel 2016, 182, 220-6.
94. Niju, S.; Vishnupriya, G.; Balajii, M. Process optimization of Calophyllum inophyllum-waste cooking oil mixture for biodiesel production using Donax deltoides shells as heterogeneous catalyst. Sustain. Environ. Res. 2019, 29, 18.
95. Madhuvilakku, R.; Mariappan, R.; Jeyapal, S.; Sundar, S.; Piraman, S. Transesterification of palm oil catalyzed by fresh water bivalve mollusk (margaritifera falcata) shell as heterogeneous catalyst. Ind. Eng. Chem. Res. 2013, 52, 17407-13.
96. Lee, S. L.; Wong, Y. C.; Tan, Y. P.; Yew, S. Y. Transesterification of palm oil to biodiesel by using waste obtuse horn shell-derived CaO catalyst. Energy. Convers. Manag. 2015, 93, 282-8.
97. Correia, L. M.; Saboya, R. M.; Campelo, Nde. S.; et al. Characterization of calcium oxide catalysts from natural sources and their application in the transesterification of sunflower oil. Bioresour. Technol. 2014, 151, 207-13.
98. Madhu, D.; Arora, R.; Sahani, S.; Singh, V.; Sharma, Y. C. Synthesis of high-quality biodiesel using feedstock and catalyst derived from fish wastes. J. Agric. Food. Chem. 2017, 65, 2100-9.
99. El-Gendy, N. S. H.; Hamdy, A.; Abu Amr, S. S. An investigation of biodiesel production from wastes of seafood restaurants. Int. J. Biomater. 2014, 2014, 609624.
100. Kedir, W. M.; Wondimu, K. T.; Weldegrum, G. S. Optimization and characterization of biodiesel from waste cooking oil using modified CaO catalyst derived from snail shell. Heliyon 2023, 9, e16475.
101. Abdul Rahim, N.; Rosdzimin Abdul Rahman, M.; Amali Bin Ahmad, K.; Rahim Mat Sarip, A.; Hasbullah, S.; Suhel, A. Analysis of waste cooking oil biodiesel (WCO) synthesis with TiO2 impregnated CaO from waste shells nano-catalyst. Mater. Today. Proc. 2023, S2214785323044681.
102. Gupta, J.; Agarwal, M. Preparation and characterizaton of CaO nanoparticle for biodiesel production. AIP. Conf. Proc. 2016, 1724, 020066.
103. Kaewdaeng, S.; Sintuya, P.; Nirunsin, R. Biodiesel production using calcium oxide from river snail shell ash as catalyst. Energy. Proc. 2017, 138, 937-42.
104. Gupta, J.; Agarwal, M.; Dalai, A. K. Experimental evaluation of the catalytic efficiency of calcium based natural and modified catalyst for biodiesel synthesis. Int. J. Green. Energy. 2017, 14, 878-88.
105. Margaretha, Y. Y.; Prastyo, H. S.; Ayucitra, A.; Ismadji, S. Calcium oxide from Pomacea sp. shell as a catalyst for biodiesel production. Int. J. Energy. Environ. Eng. 2012, 3, 33.
106. Ogunsola, A. D.; Durowoju, M. O.; Alade, A. O.; Jekayinfa, S. O.; Ogunkunle, O. Modeling and optimization of two-step shea butter oil biodiesel synthesis using snail shells as heterogeneous base catalysts. Energy. Adv. 2022, 1, 113-28.
107. Boro, J.; Thakur, A. J.; Deka, D. Solid oxide derived from waste shells of Turbonilla striatula as a renewable catalyst for biodiesel production. Fuel. Process. Technol. 2011, 92, 2061-7.
108. Ao, S.; Greer, H. F.; Alghamdi, L. A.; et al. Snail shell derived magnetic nanocatalysts for biodiesel production: process optimization through response surface methodology, kinetics, and thermodynamic studies. Biomass. Bioenergy. 2024, 191, 107442.
109. Sharma, Y. C.; Singh, B.; Korstad, J. Application of an efficient nonconventional heterogeneous catalyst for biodiesel synthesis from pongamia pinnata oil. Energy. Fuels. 2010, 24, 3223-31.
110. Marwaha, A.; Rosha, P.; Mohapatra, S. K.; Mahla, S. K.; Dhir, A. Biodiesel production from Terminalia bellerica using eggshell-based green catalyst: an optimization study with response surface methodology. Energy. Rep. 2019, 5, 1580-8.
111. Mmusi, K. C.; Odisitse, S.; Nareetsile, F. Comparison of CaO-NPs and chicken eggshell-derived CaO in the production of biodiesel from schinziophyton rautanenii (mongongo) nut oil. J. Chem. 2021, 2021, 1-15.
112. Ashine, F.; Kiflie, Z.; Prabhu, S. V.; et al. Biodiesel production from Argemone mexicana oil using chicken eggshell derived CaO catalyst. Fuel 2023, 332, 126166.
113. Erchamo, Y. S.; Mamo, T. T.; Workneh, G. A.; Mekonnen, Y. S. Improved biodiesel production from waste cooking oil with mixed methanol-ethanol using enhanced eggshell-derived CaO nano-catalyst. Sci. Rep. 2021, 11, 6708.
114. Solomon, Y.; Girma, E.; Ramayya, A. V. Amalgamation and optimization of FAEE biodiesel fuel from croton macrostachyus hochst. ex delile seed oil utilizing solid calcium oxide-chicken eggshell squander as a heterogeneous catalyst. Int. J. Anal. Chem. 2022, 2022, 7984077.
115. Alsaiari, R.; Musa, E.; Rizk, M. Effects of calcination temperature of eggshell-derived CaO as a catalyst for biodiesel production from waste cooking oil. S. Afr. J. Chem. 2023, 77, 30-5.
116. Kumar, H.; Renita, A. A.; Jabasingh, S. A. Biodiesel production from preutilized cooking oil using a renewable heterogeneous eggshell-coconut pith catalyst: process optimization and characterization. Environ. Prog. Sustain. Energy. 2021, 40, e13632.
117. AVSLSai, B.; Subramaniapillai, N.; Khadhar, Mohamed. M. S. B.; Narayanan, A. Optimization of continuous biodiesel production from rubber seed oil (RSO) using calcined eggshells as heterogeneous catalyst. J. Environ. Chem. Eng. 2020, 8, 103603.
118. Rahman, W. U.; Fatima, A.; Anwer, A. H.; et al. Biodiesel synthesis from eucalyptus oil by utilizing waste egg shell derived calcium based metal oxide catalyst. Process. Saf. Environ. Prot. 2019, 122, 313-9.
119. Foroutan, R.; Mohammadi, R.; Esmaeili, H.; Mirzaee, Bektashi. F.; Tamjidi, S. Transesterification of waste edible oils to biodiesel using calcium oxide@magnesium oxide nanocatalyst. Waste. Manag. 2020, 105, 373-83.
120. Talha, N. S.; Sulaiman, S. In situ transesterification of solid coconut waste in a packed bed reactor with CaO/PVA catalyst. Waste. Manag. 2018, 78, 929-37.
121. Niju, S. S.; Begum, K. M. M.; Anantharaman, N. Continuous flow reactive distillation process for biodiesel production using waste egg shells as heterogeneous catalysts. RSC. Adv. 2014, 4, 54109-14.
122. Fayyazi, E.; Ghobadian, B.; van, de. Bovenkamp. H. H.; et al. Optimization of biodiesel production over chicken eggshell-derived CaO catalyst in a continuous centrifugal contactor separator. Ind. Eng. Chem. Res. 2018, 57, 12742-55.
123. Proença, B. D. S. G.; Fioroto, P. O.; Heck, S. C.; et al. Obtention of methyl esters from macauba oil using egg shell catalyst. Chem. Eng. Res. Des. 2021, 169, 288-96.
124. Piker, A.; Tabah, B.; Perkas, N.; Gedanken, A. A green and low-cost room temperature biodiesel production method from waste oil using egg shells as catalyst. Fuel 2016, 182, 34-41.
125. Viriya-Empikul, N.; Krasae, P.; Puttasawat, B.; Yoosuk, B.; Chollacoop, N.; Faungnawakij, K. Waste shells of mollusk and egg as biodiesel production catalysts. Bioresour. Technol. 2010, 101, 3765-7.
126. Kirubakaran, M.; Arul, Mozhi. Selvan. V. Experimental investigation on the effects of micro eggshell and nano-eggshell catalysts on biodiesel optimization from waste chicken fat. Bioresour. Technol. Rep. 2021, 14, 100658.
127. Kirubakaran, M.; Arul, Mozhi. Selvan. V. Biodiesel production from waste chicken oil using nanoeggshell heterogeneous catalyst with isopropyl ether as cosolvent. Environ. Qual. Manag. 2020, 31, 51-64.
128. Khemthong, P.; Luadthong, C.; Nualpaeng, W.; et al. Industrial eggshell wastes as the heterogeneous catalysts for microwave-assisted biodiesel production. Catal. Today. 2012, 190, 112-6.
129. Goli, J.; Sahu, O. Development of heterogeneous alkali catalyst from waste chicken eggshell for biodiesel production. Renew. Energy. 2018, 128, 142-54.
130. Ayoola, A.; Fayomi, O.; Adeeyo, O.; Omodara, J.; Adegbite, O. Impact assessment of biodiesel production using CaO catalyst obtained from two different sources. Cogent. Eng. 2019, 6, 1615198.
131. Navajas, A.; Issariyakul, T.; Arzamendi, G.; Gandía, L.; Dalai, A. Development of eggshell derived catalyst for transesterification of used cooking oil for biodiesel production. Asia. Pac. J. Chem. Eng. 2013, 8, 742-8.
132. Bharadwaj, A. S.; Singh, M.; Niju, S.; Begum, K. M. S.; Anantharaman, N. Biodiesel production from rubber seed oil using calcium oxide derived from eggshell as catalyst - optimization and modeling studies. Green. Process. Synth. 2019, 8, 430-42.
133. Moradi, G.; Mohammadi, F. Utilization of waste coral for biodiesel production via transesterification of soybean oil. Int. J. Environ. Sci. Technol. 2013, 11, 805-12.
134. Teo, S. H.; Islam, A.; Ng, F. L.; Taufiq-Yap, Y. H. Biodiesel synthesis from photoautotrophic cultivated oleoginous microalgae using a sand dollar catalyst. RSC. Adv. 2015, 5, 47140-52.
135. Suwannasom, P.; Tansupo, P.; Ruangviriyachai, C. A bone-based catalyst for biodiesel production from waste cooking oil. Energy. Sources. Part. A. 2016, 38, 3167-73.
136. Sulaiman, S.; Abdul, Jamaludin. N. F.; Kabbashi, N. A. Development of CaO/PVA catalyst from fish bone for biodiesel production. Bull. Chem. React. Eng. Catal. 2019, 14, 153-7.
137. Maneerung, T.; Kawi, S.; Dai, Y.; Wang, C. Sustainable biodiesel production via transesterification of waste cooking oil by using CaO catalysts prepared from chicken manure. Energy. Convers. Manag. 2016, 123, 487-97.
138. Maneerung, T.; Kawi, S.; Wang, C. Biomass gasification bottom ash as a source of CaO catalyst for biodiesel production via transesterification of palm oil. Energy. Convers. Manag. 2015, 92, 234-43.
139. Bazargan, A.; Kostić, M. D.; Stamenković, O. S.; Veljković, V. B.; Mckay, G. A calcium oxide-based catalyst derived from palm kernel shell gasification residues for biodiesel production. Fuel 2015, 150, 519-25.
140. Kostić, M. D.; Bazargan, A.; Stamenković, O. S.; Veljković, V. B.; Mckay, G. Optimization and kinetics of sunflower oil methanolysis catalyzed by calcium oxide-based catalyst derived from palm kernel shell biochar. Fuel 2016, 163, 304-13.
141. Ajala, E.; Ajala, M.; Ajao, A.; Saka, H.; Oladipo, A. Calcium-carbide residue: a precursor for the synthesis of CaO-Al2O3-SiO2-CaSO4 solid acid catalyst for biodiesel production using waste lard. Chem. Eng. J. Adv. 2020, 4, 100033.
142. Ajala, E.; Ehinmowo, A.; Ajala, M.; Ohiro, O.; Aderibigbe, F.; Ajao, A. Optimisation of CaO-Al2O3-SiO2-CaSO4-based catalysts performance for methanolysis of waste lard for biodiesel production using response surface methodology and meta-heuristic algorithms. Fuel. Process. Technol. 2022, 226, 107066.
143. Liu, M.; Huang, Y.; Liu, Q.; et al. Ferric oxide as a support of carbide slag for effective transesterification of triglycerides in soybean oil. Energy. Convers. Manag. 2019, 198, 111785.
144. Liu, M.; Niu, S.; Lu, C.; Cheng, S. An optimization study on transesterification catalyzed by the activated carbide slag through the response surface methodology. Energy. Convers. Manag. 2015, 92, 498-506.
145. Potorochenko, A. N.; Gyrdymova, Y. V.; Rodygin, K. S. Waste-derived catalyst for biodiesel manufacturing in CO2-free manner: preparation, catalytic activity, and reuse studies. ChemCatChem 2025, 17, e202401607.
146. Rodygin, K. S.; Gyrdymova, Y. V.; Ananikov, V. P. Calcium carbide residue - a key inorganic component of the sustainable carbon cycle. Russ. Chem. Rev. 2022, 91, RCR5048.
147. Bawab, J.; El-Hassan, H.; El-Dieb, A.; Khatib, J.; El-Mir, A. Utilization of calcium carbide residue as a concrete component: a comprehensive review. Сase. Stud. Constr. Mater. 2025, 22, e04823.
148. Rodygin, K. S.; Bogachenkov, A. S.; Gyrdymova, Y. V.; Potorochenko, A. N. 13C-Labeling as a method in organic synthesis, catalysis and biochemical applications. Chem. Methods. 2024, 5, e202400045.
149. Gyrdymova, Y. V.; Potorochenko, A. N. Reactions of calcium carbide catalyzed by transition metals: recent advances and prospects. Russ. Chem. Bull. 2025, 74, 1576-91.
150. Potorochenko, A. N.; Rodygin, K. S.; Ananikov, V. P. Assembly of (2×C2+C’2)×n molecular complexity using a sequence of Pt- and Pd-catalyzed transformations with calcium carbide. Eur. J. Org. Chem. 2023, 27, e202301012.
151. Korabelnikova, V. A.; Gyrdymova, Y. V.; Gordeev, E. G.; Potorochenko, A. N.; Rodygin, K. S.; Ananikov, V. P. 3D printing for safe organic synthesis in mixed liquid/gas-phase chemistry. React. Chem. Eng. 2025, 10, 2474-89.
152. Wu, J.; Ma, Y.; Wang, Y.; et al. Copper-catalyzed direct synthesis of 3-methylene-2-arylisoindolin-1-ones with calcium carbide as a surrogate of gaseous acetylene. Green. Chem. 2023, 25, 3425-30.
153. Liu, Z.; Wang, Z.; Liao, H.; Li, Z. One-pot synthesis of 1,2,3-triarylindoles through cascade reactions using calcium carbide, iodoarenes, and aromatic amines. Org. Lett. 2023, 25, 5812-6.
154. Liu, L.; Sun, G.; Zhang, J. Constructing 5-methyl-2,4-diaryl-1H-imidazoles using calcium carbide as alkyne source via A3-coupling cyclization. Adv. Synth. Catal. 2023, 365, 1801-5.
155. Liu, H.; You, X.; Wen, F.; Zhang, Z.; Li, Z. Calcium carbide as a surrogate of acetylene: copper-catalyzed construction of 3-methylene-2-arylisoindolin-1-ones. Asian. J. Org. Chem. 2022, 11, e202200204.
156. Jing, T.; Liu, N.; Xu, C.; Bu, Q. Zinc chloride-promoted coupling reaction between calcium carbide and aryl chlorides. Eur. J. Org. Chem. 2022, 2022, e202200178.
157. An, R.; Cui, W.; Gu, P.; Wei, M. Highly stereoselective synthesis ofN-sulfonyl amidines with calcium carbide as an acetylene source. Org. Chem. Front. 2025, 12, 6588-93.
158. Wang, Z.; Liu, Z.; Wang, B.; Li, Z. Construction of 2-methylindoles using solid calcium carbide as a substitute for gaseous acetylene. Eur. J. Org. Chem. 2024, 27, e202301262.
159. Wang, B.; You, X.; Wang, J.; Li, Z. Highly stereoselective synthesis of 2-Acyl-3-sulfonamidobut-2-enoates using solid calcium carbide as a substitute for gaseous acetylene. Org. Lett. 2024, 26, 6269-73.
160. Potorochenko, A. N.; Rodygin, K. S. Calcium waste as a catalyst in the transesterification for demanding esters: scalability perspective. Beilstein. J. Org. Chem. 2025, 21, 1520-7.
161. Wang, F.; Li, H.; Gao, J.; et al. High efficiency removal of NO using waste calcium carbide slag by facile KOH modification. J. Environ. Sci. 2024, 139, 182-92.
162. Gong, X.; Zhang, T.; Zhang, J.; et al. Recycling and utilization of calcium carbide slag - current status and new opportunities. Renew. Sustain. Energy. Rev. 2022, 159, 112133.
163. Lotsman, K. A.; Rodygin, K. S. Calcium carbide residue - a promising hidden source of hydrogen. Green. Chem. 2023, 25, 3524-32.
164. Samoylenko, D. E.; Rodygin, K. S.; Ananikov, V. P. Sustainable application of calcium carbide residue as a filler for 3D printing materials. Sci. Rep. 2023, 13, 4465.
165. Potorochenko, A. N.; Ovchinnikov, A. A.; Rodygin, K. S. Two times faster glycolysis of poly(ethylene terephthalate) with CaO filler-catalyst. J. Compos. Sci. 2025, 9, 680.
166. Mohammadi Darestani, A.; Arabani, M.; Zanganeh Ranjbar, P.; Payan, M.; Salimi, M. Strength enhancement of calcium carbide residue-stabilized clay with perlite powder and water treatment sludge. Sci. Rep. 2025, 15, 43701.
167. Anandan Govindan, S.; Mudavath, H.; Vaddemani, G. P. R. Evaluating the sustainability of using calcium carbide residue for clay stabilization: integrating mechanical behaviour and life cycle assessment. Environ. Sci. Pollut. Res. 2025, 32, 15772-89.
168. Moazami, D.; Pourabbas, Bilondi. M.; Rahnama, A.; Zaresefat, M.; Moretti, L. Recycled glass powder and calcium carbide residue geopolymer to stabilise silty sand soil: Mechanical performances and statistical analysis. Heliyon 2025, 11, e41738.
169. Wang, Q.; Guo, H.; Yu, T.; Yuan, P.; Deng, L.; Zhang, B. Utilization of calcium carbide residue as solid alkali for preparing fly ash-based geopolymers: dependence of compressive strength and microstructure on calcium carbide residue, water content and curing temperature. Materials 2022, 15, 973.
170. Ma, W.; Zhu, G.; Guan, X.; et al. An innovative approach to prepare calcium oxide from calcium carbide slag based on sequential mineral transformation. ACS. Sustain. Resour. Manag. 2024, 1, 1279-90.
171. Liu, M. Q.; Niu, S. L.; Lu, C. M. The study on the transesterification catalyzed by sodium compound loaded on carbide slag. Appl. Mech. Mater. 2015, 733, 195-8.
172. Wang, T.; Tan, J.; Liu, J.; Tang, Y.; He, Y.; Cui, X. Valorizing and detoxifying alkaline lime mud waste from pulp mills via the production of high activity lime and lye. J. Environ. Chem. Eng. 2025, 13, 118010.
173. Li, H.; Niu, S.; Lu, C.; Liu, M.; Huo, M. Use of lime mud from paper mill as a heterogeneous catalyst for transesterification. Sci. China. Technol. Sci. 2013, 57, 438-44.
174. M, K.; Sundararaman, S.; J, A. K.; Deivasigamani, P.; M, R. Synthesis and characterization of barium doped CaO heterogeneous nanocatalyst for the production of biodiesel from Catharanthus roseus seeds: Kinetics, optimization and performance evaluation. Environ. Res. 2023, 222, 115336.
175. Aghel, B.; Gouran, A.; Shahsavari, P. Optimizing the production of biodiesel from waste cooking oil utilizing industrial waste-derived MgO/CaO catalysts. Chem. Eng. Technol. 2022, 45, 348-54.
176. Risso, R.; Ferraz, P.; Meireles, S.; Fonseca, I.; Vital, J. Highly active Cao catalysts from waste shells of egg, oyster and clam for biodiesel production. Appl. Catal. A. Gen. 2018, 567, 56-64.
177. Cho, Y. B.; Seo, G.; Chang, D. R. Transesterification of tributyrin with methanol over calcium oxide catalysts prepared from various precursors. Fuel. Process. Technol. 2009, 90, 1252-8.
178. Alba-Rubio, A. C.; Santamaría-González, J.; Mérida-Robles, J. M.; et al. Heterogeneous transesterification processes by using CaO supported on zinc oxide as basic catalysts. Catal. Today. 2010, 149, 281-7.
179. Mazaheri, H.; Ong, H. C.; Masjuki, H.; et al. Rice bran oil based biodiesel production using calcium oxide catalyst derived from Chicoreus brunneus shell. Energy 2018, 144, 10-9.
180. Kawashima, A.; Matsubara, K.; Honda, K. Acceleration of catalytic activity of calcium oxide for biodiesel production. Bioresour. Technol. 2009, 100, 696-700.
181. Trisupakitti, S.; Ketwong, C.; Senajuk, W.; Phukapak, C.; Wiriyaumpaiwong, S. Golden apple cherry snail shell as catalyst for heterogeneous transesterification of biodiesel. Braz. J. Chem. Eng. 2018, 35, 1283-91.
182. Krishnamurthy, K.; Sridhara, S.; Ananda, Kumar. C. Optimization and kinetic study of biodiesel production from Hydnocarpus wightiana oil and dairy waste scum using snail shell CaO nano catalyst. Renew. Energy. 2020, 146, 280-96.
183. Correia, L. M.; De, Sousa. Campelo. N.; Novaes, D. S.; et al. Characterization and application of dolomite as catalytic precursor for canola and sunflower oils for biodiesel production. Chem. Eng. J. 2015, 269, 35-43.
184. Boro, J.; Konwar, L. J.; Thakur, A. J.; Deka, D. Ba doped CaO derived from waste shells of T striatula (TS-CaO) as heterogeneous catalyst for biodiesel production. Fuel 2014, 129, 182-7.
185. Fasanya, O. O.; Gbadamasi, S.; Osigbesan, A. A.; et al. Effect of hydrothermal treatment on the properties of calcium oxide from eggshells used as a biodiesel catalyst. Chem. Eng. Technol. 2021, 45, 283-90.
186. Kojima, Y.; Takai, S. Transesterification of vegetable oil with methanol using solid base catalyst of calcium oxide under ultrasonication. Chem. Eng. Proc. 2019, 136, 101-6.
187. Acosta, P. I.; Campedelli, R. R.; Correa, E. L.; et al. Efficient production of biodiesel by using a highly active calcium oxide prepared in presence of pectin as heterogeneous catalyst. Fuel 2020, 271, 117651.
188. Degfie, T. A.; Mamo, T. T.; Mekonnen, Y. S. Optimized biodiesel production from waste cooking oil (WCO) using calcium oxide (CaO) nano-catalyst. Sci. Rep. 2019, 9, 18982.
189. Li, F.; Li, H.; Wang, L.; Cao, Y. Waste carbide slag as a solid base catalyst for effective synthesis of biodiesel via transesterification of soybean oil with methanol. Fuel. Process. Technol. 2015, 131, 421-9.
190. Liu, J.; Liu, M.; Chen, S.; et al. Conversion of Au(III)-polluted waste eggshell into functional CaO/Au nanocatalyst for biodiesel production. Green. Energy. Environ. 2022, 7, 352-9.
191. Campos-Molina, M. J.; Santamaría-González, J.; Mérida-Robles, J.; et al. Base catalysts derived from hydrocalumite for the transesterification of sunflower oil. Energy. Fuels. 2009, 24, 979-84.
192. Zhang, M.; Ramya, G.; Brindhadevi, K.; et al. RETRACTED: microwave assisted biodiesel production from chicken feather meal oil using bio-nano calcium oxide derived from chicken egg shell. Environ. Res. 2022, 205, 112509.
193. Rahmayanti, M.; Fatimah, I.; Yahdiyani, Ikhsani. A.; Nur, Azizah. D. The potential of calcium oxide nanocatalyst from chicken eggshells for biodiesel production using chicken fat waste. Inorg. Chem. Commun. 2024, 165, 112604.
194. Zhu, H.; Wu, Z.; Chen, Y.; et al. Preparation of biodiesel catalyzed by solid super base of calcium oxide and its refining process. Chine. J. Catal. 2006, 27, 391-6.
195. Sochima, E. V.; Aigbodion, V. S.; Von, Kallon. D. V. Correlation between biodiesel parameters and output of CaO nanoparticles from oyster catalyst on waste cooking oil. Biomass. Conv. Bioref. 2023, 14, 23461-72.
196. Das, V.; Tripathi, A. M.; Borah, M. J.; Dunford, N. T.; Deka, D. Cobalt-doped CaO catalyst synthesized and applied for algal biodiesel production. Renew. Energy. 2020, 161, 1110-9.
197. Cho, Y. B.; Seo, G. High activity of acid-treated quail eggshell catalysts in the transesterification of palm oil with methanol. Bioresour. Technol. 2010, 101, 8515-9.
198. Kalanakoppal Venkatesh, Y.; Mahadevaiah, R.; Haraluru Shankaraiah, L.; Ramappa, S.; Sannagoudar Basanagouda, A. Preparation of a CaO nanocatalyst and its application for biodiesel production using Butea monosperma oil: an optimization study. J. Am. Oil. Chem. Soc. 2018, 95, 635-49.
199. Pandit, P. R.; Fulekar, M. Egg shell waste as heterogeneous nanocatalyst for biodiesel production: optimized by response surface methodology. J. Environ. Manag. 2017, 198, 319-29.
200. Fadhil, A. B.; Al-tikrity, E. T.; Khalaf, A. M. Transesterification of non-edible oils over potassium acetate impregnated CaO solid base catalyst. Fuel 2018, 234, 81-93.
201. Yan, S.; Lu, H.; Liang, B. Supported CaO catalysts used in the transesterification of rapeseed oil for the purpose of biodiesel production. Energy. Fuels. 2007, 22, 646-51.
202. Shi, M.; Zhang, P.; Fan, M.; Jiang, P.; Dong, Y. Influence of crystal of Fe2O3 in magnetism and activity of nanoparticle CaO@Fe2O3 for biodiesel production. Fuel 2017, 197, 343-7.
203. Kesica, Z.; Lukic, I.; Zdujic, M.; Liu, H.; Skala, D. Mechanochemically synthesized CaO ZnO catalyst for biodiesel production. Proc. Eng. 2012, 42, 1169-78.
204. El-sherif, A. A.; Hamad, A. M.; Shams-eldin, E.; et al. Power of recycling waste cooking oil into biodiesel via green CaO-based eggshells/Ag heterogeneous nanocatalyst. Renew. Energy. 2023, 202, 1412-23.
205. Poosumas, J.; Ngaosuwan, K.; Quitain, A. T.; Assabumrungrat, S. Role of ultrasonic irradiation on transesterification of palm oil using calcium oxide as a solid base catalyst. Energy. Convers. Manag. 2016, 120, 62-70.
206. Mansir, N.; Hwa, Teo. S.; Lokman, Ibrahim. M.; Yun, Hin. T. Synthesis and application of waste egg shell derived CaO supported W-Mo mixed oxide catalysts for FAME production from waste cooking oil: Effect of stoichiometry. Energy. Convers. Manag. 2017, 151, 216-26.
207. Mansir, N.; Teo, S. H.; Mijan, N.; Taufiq-yap, Y. H. Efficient reaction for biodiesel manufacturing using bi-functional oxide catalyst. Catal. Commun. 2021, 149, 106201.
208. Reyero, I.; Bimbela, F.; Navajas, A.; Arzamendi, G.; Gandía, L. M. Issues concerning the use of renewable Ca-based solids as transesterification catalysts. Fuel 2015, 158, 558-64.
209. Marques Correia, L.; Cecilia, J. A.; Rodríguez-Castellón, E.; Cavalcante, C. L.; Vieira, R. S. Relevance of the physicochemical properties of calcined quail eggshell (CaO) as a catalyst for biodiesel production. J. Chem. 2017, 2017, 1-12.
210. Chavan, S. B.; Kumbhar, R. R.; Madhu, D.; Singh, B.; Sharma, Y. C. Synthesis of biodiesel from Jatropha curcas oil using waste eggshell and study of its fuel properties. RSC. Adv. 2015, 5, 63596-604.
211. Saleem, M.; Jamil, F.; Qamar, O. A.; et al. Enhancing the catalytic activity of eggshell-derived CaO catalyst and its application in biodiesel production from waste chicken fat. Catalysts 2022, 12, 1627.
212. Birla, A.; Singh, B.; Upadhyay, S.; Sharma, Y. Kinetics studies of synthesis of biodiesel from waste frying oil using a heterogeneous catalyst derived from snail shell. Bioresour. Technol. 2012, 106, 95-100.
213. Ouafi, R.; Haldhar, R.; Mehdaoui, I.; et al. Waste snail shells-derived mixed oxide catalyst for efficient transesterification of vegetable oil: Towards sustainable biodiesel production. Mater. Today. Commun. 2024, 39, 109128.
214. Ahmad, W.; Sethupathi, S.; Munusamy, Y.; Kanthasamy, R. Valorization of raw and calcined chicken eggshell for sulfur dioxide and hydrogen sulfide removal at low temperature. Catalysts 2021, 11, 295.
215. Kouzu, M.; Kasuno, T.; Tajika, M.; Yamanaka, S.; Hidaka, J. Active phase of calcium oxide used as solid base catalyst for transesterification of soybean oil with refluxing methanol. Appl. Catal. A. Gen. 2008, 334, 357-65.
216. Nunes, A.; Castilhos, F. Chemical interesterification of soybean oil and methyl acetate to FAME using CaO as catalyst. Fuel 2020, 267, 117264.
217. Roschat, W.; Siritanon, T.; Yoosuk, B.; Promarak, V. Biodiesel production from palm oil using hydrated lime-derived CaO as a low-cost basic heterogeneous catalyst. Energy. Convers. Manag. 2016, 108, 459-67.
218. Kingkam, W.; Maisomboon, J.; Khamenkit, K.; et al. Preparation of CaO@CeO2 solid base catalysts used for biodiesel production. Catalysts 2024, 14, 240.
219. Ahmad, S.; Chaudhary, S.; Pathak, V. V.; Kothari, R.; Tyagi, V. Optimization of direct transesterification of Chlorella pyrenoidosa catalyzed by waste egg shell based heterogenous nano - CaO catalyst. Renew. Energy. 2020, 160, 86-97.
220. Helwani, Z.; Ramli, M.; Saputra, E.; et al. Impregnation of CaO from eggshell waste with magnetite as a solid catalyst (Fe3O4/CaO) for transesterification of palm oil off-grade. Catalysts 2020, 10, 164.
221. Islam, S.; Basumatary, B.; Rokhum, S. L.; Mochahari, P. K.; Basumatary, S. Advancement in utilization of nanomaterials as efficient and recyclable solid catalyst for biodiesel synthesis. Clean. Chem. Eng. 2022, 3, 100043.
222. Kaur, N.; Ali, A. Biodiesel production via ethanolysis of jatropha oil using molybdenum impregnated calcium oxide as solid catalyst. RSC. Adv. 2015, 5, 13285-95.
223. Naveen, S.; Gopinath, K. P.; Malolan, R.; Ramesh, S. J.; Aakriti, K.; Arun, J. Novel solar parabolic trough collector cum reactor for the production of biodiesel from waste cooking oil using calcium oxide catalyst derived from seashells waste. Chem. Eng. Process. 2020, 157, 108145.
224. Bharti, P.; Singh, B.; Dey, R. K. Process optimization of biodiesel production catalyzed by CaO nanocatalyst using response surface methodology. J. Nanostruct. Chem. 2019, 9, 269-80.
225. Ismail, S.; Ahmed, A. S.; Anr, R.; Hamdan, S. Biodiesel production from castor oil by using calcium oxide derived from mud clam shell. J. Renew. Energy. 2016, 2016, 1-8.
226. Tang, Y.; Xu, J.; Zhang, J.; Lu, Y. Biodiesel production from vegetable oil by using modified CaO as solid basic catalysts. J. Clean. Prod. 2013, 42, 198-203.
227. Sronsri, C.; Sittipol, W.; U-Yen, K. Performance of CaO catalyst prepared from magnetic-derived CaCO3 for biodiesel production. Fuel 2021, 304, 121419.
228. Maneechakr, P.; Karnjanakom, S. Systematic production of biodiesel fuel from palm oil over porous K2O@CaO catalyst derived from waste chicken eggshell via RSM/kinetic/thermodynamic studies. J. Environ. Chem. Eng. 2021, 9, 106542.
229. Thitsartarn, W.; Kawi, S. An active and stable CaO-CeO2 catalyst for transesterification of oil to biodiesel. Green. Chem. 2011, 13, 3423.
230. Yusuff, A. S.; Gbadamosi, A. O.; Atray, N. Development of a zeolite supported CaO derived from chicken eggshell as active base catalyst for used cooking oil biodiesel production. Renew. Energy. 2022, 197, 1151-62.
231. Das, V.; Dunford, N.; Deka, D. Waste utilization and biodiesel production from Desmodesmus maximus grown in swine wastewater using waste eggshells as a catalyst. Aquac. Eng. 2022, 99, 102293.
232. Putra, M. D.; Ristianingsih, Y.; Jelita, R.; Irawan, C.; Nata, I. F. Potential waste from palm empty fruit bunches and eggshells as a heterogeneous catalyst for biodiesel production. RSC. Adv. 2017, 7, 55547-54.
233. Tayeb, A. M.; Abdel-hamid, S. M. S.; Osman, R. M.; Farouk, S. M. Optimization of biodiesel production from waste cooking oil using nano calcium oxide catalyst. Chem. Eng. Technol. 2023, 47, 175-83.
234. Zabeti, M.; Daud, W. M. A. W.; Aroua, M. K. Biodiesel production using alumina-supported calcium oxide: an optimization study. Fuel. Process. Technol. 2010, 91, 243-8.
235. Tan, Y. H.; Abdullah, M. O.; Nolasco-Hipolito, C.; Taufiq-Yap, Y. H. Waste ostrich- and chicken-eggshells as heterogeneous base catalyst for biodiesel production from used cooking oil: Catalyst characterization and biodiesel yield performance. Appl. Energy. 2015, 160, 58-70.
236. Buasri, A.; Chaiyut, N.; Loryuenyong, V.; Worawanitchaphong, P.; Trongyong, S. Calcium oxide derived from waste shells of mussel, cockle, and scallop as the heterogeneous catalyst for biodiesel production. Sci. World. J. 2013, 2013, 460923.
237. Venkat Reddy, C. R.; Oshel, R.; Verkade, J. C. Room-Temperature conversion of soybean oil and poultry fat to biodiesel catalyzed by nanocrystalline calcium oxides. Energy. Fuels. 2006, 20, 1310-4.
238. Li, H.; Wang, Y.; Ma, X.; et al. A novel magnetic CaO-based catalyst synthesis and characterization: Enhancing the catalytic activity and stability of CaO for biodiesel production. Chem. Eng. J. 2020, 391, 123549.
239. Anr, R.; Saleh, A. A.; Islam, M. S.; Hamdan, S.; Maleque, M. A. Biodiesel production from crude jatropha oil using a highly active heterogeneous nanocatalyst by optimizing transesterification reaction parameters. Energy. Fuels. 2015, 30, 334-43.
240. Reddy, A. N. R.; Saleh, A. A.; Islam, M. S.; Hamdan, S. Active razor shell cao catalyst synthesis for jatropha methyl ester production via optimized two-step transesterification. J. Chem. 2017, 2017, 1-20.
241. Aworanti, O. A.; Agbede, O. O.; Popoola, A. O.; et al. Synthesized heterogeneous nano-catalyst from cow teeth for fatty acid methyl esters production through transesterification of waste vegetable frying oil and methanol: characterization and optimization studies. Eng. Rep. 2022, 5, e12605.
242. Badnore, A. U.; Jadhav, N. L.; Pinjari, D. V.; Pandit, A. B. Efficacy of newly developed nano-crystalline calcium oxide catalyst for biodiesel production. Chem. Eng. Process. 2018, 133, 312-9.
243. Al-muhtaseb, A. H.; Jamil, F.; Osman, A. I.; et al. State-of-the-art novel catalyst synthesised from waste glassware and eggshells for cleaner fuel production. Fuel 2022, 330, 125526.
244. Wen, L.; Wang, Y.; Lu, D.; Hu, S.; Han, H. Preparation of KF/CaO nanocatalyst and its application in biodiesel production from Chinese tallow seed oil. Fuel 2010, 89, 2267-71.
245. Hu, S.; Wen, L.; Wang, Y.; Zheng, X.; Han, H. Gas-liquid countercurrent integration process for continuous biodiesel production using a microporous solid base KF/CaO as catalyst. Bioresour. Technol. 2012, 123, 413-8.
246. Wang, Y.; Hu, S.; Guan, Y.; Wen, L.; Han, H. Preparation of mesoporous nanosized KF/CaO-MgO catalyst and its application for biodiesel production by transesterification. Catal. Lett. 2009, 131, 574-8.
247. Bazhdan, E.; Tamjidi, S.; Rouhi, P.; Esmaeili, H. Synthesis of KOH@CaO catalyst by sol-gel method for highly efficient biodiesel production from olive oil. Phys. Chem. Res. 2021, 9, 43-55.
248. Lani, N. S.; Ngadi, N.; Mohammed, Inuwa. I.; Anako, Opotu. L.; Zakaria, Z. Y.; Haron, S. A cleaner approach with magnetically assisted reactor setup over CaO-zeolite/Fe3O4 catalyst in biodiesel production: evaluation of catalytic performance, reusability and life cycle assessment studies. J. Clean. Prod. 2023, 419, 138329.
249. Lani, N. S.; Ngadi, N.; Haron, S.; Mohammed, Inuwa. I.; Anako, Opotu. L. The catalytic effect of calcium oxide and magnetite loading on magnetically supported calcium oxide-zeolite catalyst for biodiesel production from used cooking oil. Renew. Energy. 2024, 222, 119846.
250. Dahdah, E.; Estephane, J.; Moussa, Chalouhi. L.; et al. Transesterification of refined sunflower oil to biodiesel using a CaO/ZSM-5 powder catalyst. Chem. Eng. Technol. 2021, 45, 51-7.
251. Szkudlarek, Ł.; Chałupka-Śpiewak, K.; Maniukiewicz, W.; et al. CaO catalysts supported on ZSM-5 zeolite for biodiesel production via transesterification of rapeseed oil. Appl. Catal. O. Open. 2024, 194, 206999.
252. Lani, N. S.; Ngadi, N.; Inuwa, I. M.; Opotu, L. A.; Zakaria, Z. Y.; Widayat, W. Influence of desilication route of ZSM-5 zeolite in mesoporous zeolite supported calcium oxide catalyst for biodiesel production. Microporous. Mesoporous. Mater. 2022, 343, 112153.
253. Shankar, V.; Jambulingam, R. Waste crab shell derived CaO impregnated Na-ZSM-5 as a solid base catalyst for the transesterification of neem oil into biodiesel. Sustain. Environ. Res. 2017, 27, 273-8.
254. Qasemi, Z.; Jafari, D.; Jafari, K.; Esmaeili, H. Heterogeneous aluminum oxide/calcium oxide catalyzed transesterification of Mespilus germanica triglyceride for biodiesel production. Environ. Prog. Sustain. Energy. 2021, 41, e13738.
255. Dehghani, S.; Haghighi, M.; Vardast, N. Structural/texture evolution of CaO/MCM-41 nanocatalyst by doping various amounts of cerium for active and stable catalyst: biodiesel production from waste vegetable cooking oil. Int. J. Energy. Res. 2019, 43, 3779-93.
256. Dehghani, S.; Haghighi, M. Sono-enhanced dispersion of CaO over Zr-Doped MCM-41 bifunctional nanocatalyst with various Si/Zr ratios for conversion of waste cooking oil to biodiesel. Renew. Energy. 2020, 153, 801-12.
257. Firouzjaee, M. H.; Taghizadeh, M. Optimization of process variables for biodiesel production using the nanomagnetic catalyst CaO/NaY-Fe3O4. Chem. Eng. Technol. 2017, 40, 1140-8.
258. Thitsartarn, W.; Maneerung, T.; Kawi, S. Highly active and durable Ca-doped Ce-SBA-15 catalyst for biodiesel production. Energy 2015, 89, 946-56.
259. Li, H.; Wang, Y.; Han, Z.; et al. Nanosheet like CaO/C derived from Ca-BTC for biodiesel production assisted with microwave. Appl. Energy. 2022, 326, 120045.
260. Al-muhtaseb, A. H.; Jamil, F.; Al-haj, L.; et al. Biodiesel production over a catalyst prepared from biomass-derived waste date pits. Biotechnol. Rep. 2018, 20, e00284.
261. Almasi, S.; Ghobadian, B.; Dehghani, Soufi. M.; Kakavandi, B.; Aubin, J. Calcium oxide anchored on magnetic waste-based activated carbon (MAC@CaO): a sustainable green heterogeneous catalyst for bio-based fuel and lubricant production. Biomass. Bioenergy. 2024, 182, 107071.
262. Zu, Y.; Tang, J.; Zhu, W.; et al. Graphite oxide-supported CaO catalysts for transesterification of soybean oil with methanol. Bioresour. Technol. 2011, 102, 8939-44.
263. Zu, Y.; Liu, G.; Wang, Z.; et al. CaO supported on porous carbon as highly efficient heterogeneous catalysts for transesterification of triacetin with methanol. Energy. Fuels. 2010, 24, 3810-6.
264. Sun, H.; Ma, M.; Fan, M.; et al. Controllable preparation of biomass derived mesoporous activated carbon supported nano-CaO catalysts for biodiesel production. Energy 2022, 261, 125369.
265. Shahraini, N.; Entezari, M. H. Biodiesel from waste oil under mild conditions by a combination of calcium-strontium oxide nanocatalyst and ultrasonic waves. Intl. J. Energy. Res. 2022, 46, 13781-800.
266. Li, H.; Niu, S.; Lu, C.; Li, J. Calcium oxide functionalized with strontium as heterogeneous transesterification catalyst for biodiesel production. Fuel 2016, 176, 63-71.
267. Niju, S.; Meera, K.; Begum, S.; Anantharaman, N. Modification of egg shell and its application in biodiesel production. J. Saudi. Chem. Soc. 2014, 18, 702-6.
268. Das, S.; Anal, J. M. H.; Kalita, P.; Saikia, L.; Rokhum, S. L. Process optimization of biodiesel production using waste snail shell as a highly active nanocatalyst. Int. J. Energy. Res. 2023, 2023, 1-26.
269. Taufiq-yap, Y.; Lee, H.; Hussein, M.; Yunus, R. Calcium-based mixed oxide catalysts for methanolysis of Jatropha curcas oil to biodiesel. Biomass. Bioenergy. 2011, 35, 827-34.
270. Aghabarari, B.; Martinez-huerta, M. V. Biodiesel production using calcined waste filter press cake from a sugar manufacturing facility as a highly economic catalyst. J. Am. Oil. Chem. Soc. 2016, 93, 773-9.
271. Rozina,
272. Granados, M. L.; Poves, M. Z.; Alonso, D. M.; et al. Biodiesel from sunflower oil by using activated calcium oxide. Appl. Catal. B. Environ. 2007, 73, 317-26.
273. Wilkanowicz, S. I.; Hollingsworth, N. R.; Saud, K.; Kadiyala, U.; Larson, R. G. Immobilization of calcium oxide onto polyacrylonitrile (PAN) fibers as a heterogeneous catalyst for biodiesel production. Fuel. Process. Technol. 2020, 197, 106214.
274. Chen, G.; Shan, R.; Shi, J.; Yan, B. Ultrasonic-assisted production of biodiesel from transesterification of palm oil over ostrich eggshell-derived CaO catalysts. Bioresour. Technol. 2014, 171, 428-32.
275. Laskar, I. B.; Rajkumari, K.; Gupta, R.; Chatterjee, S.; Paul, B.; Rokhum, S. L. Waste snail shell derived heterogeneous catalyst for biodiesel production by the transesterification of soybean oil. RSC. Adv. 2018, 8, 20131-42.
276. Lani, N. S.; Ngadi, N.; Inuwa, I. M. New route for the synthesis of silica-supported calcium oxide catalyst in biodiesel production. Renew. Energy. 2020, 156, 1266-77.
277. Hossain, M.; Muntaha, N.; Osman, Goni. L. K. M.; et al. Triglyceride conversion of waste frying oil up to 98.46% using low concentration K+/CaO catalysts derived from eggshells. ACS. Omega. 2021, 6, 35679-91.
278. Zhang, N.; Xue, H.; Hu, R. The activity and stability of CeO2@CaO catalysts for the production of biodiesel. RSC. Adv. 2018, 8, 32922-9.
279. Niju, S.; Niyas, M.; Sheriffa, Begum. K. M. M.; Anantharaman, N. KF-impregnated clam shells for biodiesel production and its effect on a diesel engine performance and emission characteristics. Environ. Prog. Sustain. Energy. 2014, 34, 1166-73.
280. Rahul Soosai, M.; Moorthy, I. M. G.; Varalakshmi, P.; Yonas, C. J. Integrated global optimization and process modelling for biodiesel production from non-edible silk-cotton seed oil by microwave-assisted transesterification with heterogeneous calcium oxide catalyst. J. Clean. Prod. 2022, 367, 132946.
281. Zhao, L.; Qiu, Z.; Stagg-williams, S. M. Transesterification of canola oil catalyzed by nanopowder calcium oxide. Fuel. Process. Technol. 2013, 114, 154-62.
282. Liu, X.; He, H.; Wang, Y.; Zhu, S.; Piao, X. Transesterification of soybean oil to biodiesel using CaO as a solid base catalyst. Fuel 2008, 87, 216-21.
283. Liu, C.; Lv, P.; Yuan, Z.; Yan, F.; Luo, W. The nanometer magnetic solid base catalyst for production of biodiesel. Renew. Energy. 2010, 35, 1531-6.
284. Lani, N. S.; Ngadi, N.; Yahya, N. Y.; Rahman, R. A. Synthesis, characterization and performance of silica impregnated calcium oxide as heterogeneous catalyst in biodiesel production. J. Clean. Prod. 2017, 146, 116-24.
285. Bet-moushoul, E.; Farhadi, K.; Mansourpanah, Y.; Nikbakht, A. M.; Molaei, R.; Forough, M. Application of CaO-based/Au nanoparticles as heterogeneous nanocatalysts in biodiesel production. Fuel 2016, 164, 119-27.
286. Shan, R.; Chen, G.; Yan, B.; Shi, J.; Liu, C. Porous CaO-based catalyst derived from PSS-induced mineralization for biodiesel production enhancement. Energy. Convers. Manag. 2015, 106, 405-13.
287. Ngamcharussrivichai, C.; Meechan, W.; Ketcong, A.; Kangwansaichon, K.; Butnark, S. Preparation of heterogeneous catalysts from limestone for transesterification of vegetable oils - Effects of binder addition. J. Ind. Eng. Chem. 2011, 17, 587-95.
288. Boey, P.; Maniam, G. P.; Hamid, S. A. Biodiesel production via transesterification of palm olein using waste mud crab (Scylla serrata) shell as a heterogeneous catalyst. Bioresour. Technol. 2009, 100, 6362-8.
289. Niju, S.; Sheriffa, Begum. K. M. M.; Anantharaman, N. Preparation of biodiesel from waste frying oil using a green and renewable solid catalyst derived from egg shell. Environ. Prog. Sustain. Energy. 2014, 34, 248-54.
290. Wei, Z.; Xu, C.; Li, B. Application of waste eggshell as low-cost solid catalyst for biodiesel production. Bioresour. Technol. 2009, 100, 2883-5.
291. Zhang, S.; Fu, J.; Xing, S.; et al. Sodium silicates modified calcium oxide as a high-performance solid base catalyst for biodiesel production. Catalysts 2023, 13, 775.
292. Chen, G.; Shan, R.; Li, S.; Shi, J. A biomimetic silicification approach to synthesize CaO-SiO2 catalyst for the transesterification of palm oil into biodiesel. Fuel 2015, 153, 48-55.
293. Ozor, P. A.; Aigbodion, V. S.; Sukdeo, N. I. Modified calcium oxide nanoparticles derived from oyster shells for biodiesel production from waste cooking oil. Fuel. Commun. 2023, 14, 100085.
294. Hu, S.; Guan, Y.; Wang, Y.; Han, H. Nano-magnetic catalyst KF/CaO-Fe3O4 for biodiesel production. Appl. Energy. 2011, 88, 2685-90.
295. Tang, Y.; Li, S.; Dong, J.; Meng, M.; Zhang, J. An efficient CaO-based catalyst for rapid production of biodiesel without glycerol as a by-product using a tri-component reaction. J. Am. Oil. Chem. Soc. 2018, 95, 1487-96.
296. Chakraborty, R.; Bepari, S.; Banerjee, A. Transesterification of soybean oil catalyzed by fly ash and egg shell derived solid catalysts. Chem. Eng. J. 2010, 165, 798-805.
297. Lin, L.; Vittayapadung, S.; Li, X.; Jiang, W.; Shen, A. X. Synthesis of magnetic calcium oxide hollow fiber catalyst for the production of biodiesel. Env. Prog. Sustain. Energy. 2012, 32, 1255-61.
298. Potorochenko, A. N.; Ovchinnikov, A. A.; Rodygin, K. S. Centrifugation, filtration or magnetic extraction: evaluation of catalyst recovery technique in biodiesel production. Bioresour. Technol. Rep. 2026, 33, 102471.
299. Ferreira, G. F.; Pinto, L. F. R.; Filho, R. M.; Fregolente, L. V.; Hayward, J.; Bartley, J. K. Ethanol-based transesterification of rapeseed oil with CaO catalyst: process optimization and validation using microalgal lipids. Catal. Lett. 2025, 155, 84.
300. Ochoa-Gómez, J. R.; Gómez-Jiménez-Aberasturi, O.; Maestro-Madurga, B.; et al. Synthesis of glycerol carbonate from glycerol and dimethyl carbonate by transesterification: Catalyst screening and reaction optimization. Appl. Catal. A. Gen. 2009, 366, 315-24.
301. Roschat, W.; Phewphong, S.; Thangthong, A.; et al. Catalytic performance enhancement of CaO by hydration-dehydration process for biodiesel production at room temperature. Energy. Convers. Manag. 2018, 165, 1-7.
302. Kaur, A.; Ali, A. Surface-modified CaO catalyst for the production of glycerol carbonate. ChemistrySelect 2021, 6, 6102-14.
303. Zheng, H.; He, Y.; Zhu, Y.; Liu, L.; Cui, X. Novel procedure of CO2 capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag. RSC. Adv. 2021, 11, 12476-83.
304. Khawaja, A. S.; Zaheer, M. A.; Ahmad, A.; Mirani, A. A.; Ali, Z. Advances in limitations and opportunities of clean biofuel production to promote decarbonization. Fuel 2023, 342, 127662.
305. Vitidsant, R.; Kodama, S.; Sekiguchi, H. Transesterification using ultrasonic spray of triolein containing CaO particles into methanol vapor in a 3-phase reactor. Processes 2021, 9, 181.
