Investigation of catalytic methane oxidation over Ag/Co2MO (M = Co, Ni, Cu) catalysts with varying interfacial electron transfer

• DOI: 10.1016/j.jcis.2024.04.162
• Publication Date: 2024-04-24T06:11:20Z
• Authors: Hang Zhang; Linghe Song; Zimeng Nie; Juntai Tian; Jie Yang; Peng Liu; Limin Chen; Mingli Fu; Haomin Huang; Daiqi Ye

Atom-doped Co3O4 catalysts loaded with Ag were examined as cost-effective catalysts for methane oxidation. The synthesized Ag/Co2NiOx catalysts exhibited distinctive surface characteristics in contrast with Ag/Co3O4 and Ag/Co2CuOx catalysts prepared using a similar method. Characterization results unveiled that Ag/Co2NiOx featured a higher presence of active surface oxygen species, lattice defects, a larger surface area, and enhanced reducibility. A methane oxidation catalytic performance followed the sequence: Ag/Co2NiOx > Ag/Co3O4 > Ag/Co2CuOx. The investigation delved into methane degradation pathways on the surfaces of three catalysts, examining their behavior under both aerobic and anaerobic atmospheres through in-situ DRIFTS analysis. Furthermore, introducing Ag showed a marked positive effect on Co-Ni mixed oxide, inducing electron transfer and a more active electron system, whereas it exhibited an inverse impact within the surface of Co-Cu mixed oxide. This work provides innovative perspectives on the development of forthcoming environmental catalysts.