Investigation of catalytic methane oxidation over Ag/Co2MOx (M = Co, Ni, Cu) catalysts with varying interfacial electron transfer

Hang Zhang; Linghe Song; Zimeng Nie; Juntai Tian; Jie Yang; Peng Liu; Limin Chen; Mingli Fu; Haomin Huang; Daiqi Ye

doi:10.1016/j.jcis.2024.04.162

Investigation of catalytic methane oxidation over Ag/Co₂MO_x (M = Co, Ni, Cu) catalysts with varying interfacial electron transfer

J Colloid Interface Sci. 2024 Aug 15:668:412-425. doi: 10.1016/j.jcis.2024.04.162. Epub 2024 Apr 24.

Authors

Hang Zhang¹, Linghe Song¹, Zimeng Nie¹, Juntai Tian¹, Jie Yang², Peng Liu³, Limin Chen⁴, Mingli Fu⁴, Haomin Huang⁴, Daiqi Ye⁵

Affiliations

¹ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
² Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co., Ltd., Foshan 528300, China; Midea Group Co.,Ltd., Foshan 528300, China.
³ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China.
⁴ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China.
⁵ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China. Electronic address: cedqye@scut.edu.cn.

PMID: 38688180
DOI: 10.1016/j.jcis.2024.04.162

Abstract

Atom-doped Co₃O₄ catalysts loaded with Ag were examined as cost-effective catalysts for methane oxidation. The synthesized Ag/Co₂NiO_x catalysts exhibited distinctive surface characteristics in contrast with Ag/Co₃O₄ and Ag/Co₂CuO_x catalysts prepared using a similar method. Characterization results unveiled that Ag/Co₂NiO_x 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/Co₂NiO_x > Ag/Co₃O₄ > Ag/Co₂CuO_x. 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.

Keywords: Active oxygen species; Electron transfer; Methane combustion; Oxygen vacancies.