fig5

Figure 5. (A) Possible reaction pathway of the direct oxidation of methane with N₂O on the Fe-AEI zeolite catalyst. Reprinted with permission from ref^[102]. Copyright 2023. American Chemical Society; (B) Comparing conversion and selectivity of H-type Fe-CHA(Na)-100 and Fe-CHA(Na free)-100 at 250 °C; (C) Direct oxidation of methane to methanol on active Fe sites over Fe-containing zeolites. Reprinted with permission from ref^[103]. Copyright 2024. American Chemical Society; (D) Schematic representation of Fe(II) located in the β cationic position and the α cationic position; (E) Time dependence of the evolution of the bands characteristic for α-O and Fe(II) in β sites. Reprinted with permission from ref^[56]. Copyright 2023. American Chemical Society.