fig9

Figure 9. (A) Possible catalytic cycle for the methane to methanol conversion by MO⁺-ZSM-5; (B) Optimized structures of CoO⁺-and NiO⁺-ZSM-5 in the corresponding high-spin state. Reprinted with permission from ref^[142]. Copyright 2016. American Chemical Society; (C) Probable scenarios of the reaction pathway for methane overoxidation to formaldehyde (CH₂O) and dimethyl ether (C₂H₆O) over Ni-ZSM-5 zeolites. Reprinted with permission from ref^[144]. Copyright 2021. American Chemical Society; (D) ²⁷Al MAS NMR spectra of FER zeolites after dealumination and supplement Al by impregnation; Positions of four crystallographically independent T sites and the two perpendicular intersecting channels accessible via (E) 001 and (F) 010 faces. Reprinted with permission from ref^[146]. Copyright 2024. American Chemical Society. ²⁷Al MAS NMR: ²⁷Al magic-angle spinning nuclear magnetic resonance.