fig4

Figure 4. (A) Catalytic cycle for the liquid-phase oxidation of methane to methanol over the binuclear Fe³⁺ species in MOR. Reprinted with permission from ref^[78]. Copyright 2019. the Royal Society of Chemistry; (B) [(H₂O)₂–Fe(III)–(μ-O)₂–Fe(III)–(H₂O)₂]²⁺ model in ZSM5 zeolite. Reprinted with permission from ref^[96]. Copyright 2018. American Chemical Society; [C(i)-(iii)] STEM images of the 0.1% Fe/ZSM-5. [C(iv)] Elemental mapping images of the 0.1% Fe/ZSM-5. Reprinted with permission from ref^[98]. Copyright 2021. The Royal Society of Chemistry; Low-magnification [D(i)] TEM, [D(ii)] STEM, and C_s-corrected. [D(iii)] STEM-ADF and [D(iv)] STEM-ABF images of 0.44Fe@Z-L_0.3H₆-9. [D(v)-(viii)] Elemental mappings for Si, Al, O, and Fe elements; (E) Proposed reaction mechanisms and schematic illustrations for the selective oxidation of methane on the mononuclear Fe³⁺. Reprinted with permission from ref^[82]. Copyright 2024. The Chinese Chemical Society. STEM: Scanning transmission electron microscopy; TEM: transmission electron microscopy; ADF: annular dark-field; ABF: annular bright-field.