fig9

Figure 9. (A) Cycle photo-driven methane non-oxidative coupling reaction over Ga-doped hierarchical porous Pt-TiO₂−SiO₂(2%). Every run is carried out under direct irradiation from a 300 W Xe lamp for 4 h. Reproduced with permission from Ref^[59]. Copyright 2019, American Chemical Society; (B) The cycle of photocatalytic methane non-oxidative coupling reactions over TiO₂–SiO₂. Reproduced with permission from Ref^[60]. Copyright 2021, Wiley-VCH; (C) Production rates and selectivity of C₂H₆ in the cyclic tests by Pd/TiO₂. Each cycle lasts 3 h, during which the catalyst is treated in air. Reproduced with permission from Ref^[48]. Copyright 2023, Springer Nature.