fig12

Figure 12. Room-temperature CH₄ conversion by O₂ over the MoS₂ and MMO catalysts. Schematic illustration for the reaction cycle over the bi-Mo sites of SVs at the MoS₂ edge (A) and the bi-Fe sites in the hydroxylase of MMO (Protein Data Bank 1FYZ) (B). Mo: cyan; S: yellow; O: red; C: grey (A) or green (B); H: white; Fe: orange; N: blue; (C) Simulated image and the corresponding atomic configurations of MoS₂ showing the quintuple SVs at the edge denoted by dotted circles; (D) In situ DRIFTS spectra showing the variation of relative intensities of the Mo = O and Mo-O-Mo peaks when CH₄ passes through the O₂-pretreated and H₂O-pretreated MoS₂ catalyst at 298 K^[139]. Copyright 2023, Springer Nature. MMO: Methane monooxygenase; SVs: sulfur vacancies; PDB: protein data bank; DRIFTS: diffuse reflectance infrared Fourier transform spectroscopy.