Direct and selective oxidation of methane into methanol over Cu/Fe-containing zeolites

Direct transformation of methane into methanol with high selectivity under mild conditions is one of the holy grails in catalysis. The major challenges arise from the high stability of the primary C-H bonds and the facile overoxidation of methanol. Among the numerous catalytic materials applied, Cu/Fe-containing zeolite catalysts have garnered considerable efforts and intensive investigation due to their significant advantages and distinctive potential in direct and selective oxidation of methane into methanol. In this Prospect, we present the recent progress of the application of Cu/Fe-containing zeolites as catalysts for the direct oxidation of methane into methanol. Furthermore, the state-of-the-art ex/in situ characterization techniques applied to understand the intrinsic active sites and reaction mechanisms for Cu/Fe-containing zeolites are also highlighted. Finally, the open challenges and opportunities regarding rational design of catalysts, the development of correlative in situ/operando characterization technologies and the feasible approaches by coupling with external energy resources or with other promising C-C coupling processes, are examined for inspiring future directions.