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Reaction Mechanisms and Advanced Catalysts for Photothermal CO2 Methanation: A Comprehensive Review
Kang Xie1, Zhourong Xiao1, Leshi Zhang1
1State Key Laboratory of Metastable Materials Science and Technology (MMST), Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, China.
Abstract:
The excessive emission of CO2 has triggered a range of environmental challenges, including ocean acidification and the greenhouse effect. To mitigate this issue, the catalytic conversion of CO2 into value-added chemicals has garnered significant attention. Among various approaches, photothermal catalytic CO2 methanation stands out due to its mild reaction conditions and high product selectivity. In recent years, photothermal catalytic CO2 methanation has made significant progress in the study of reaction mechanisms, regulation of catalyst structure and properties, and corresponding photothermal reactors. This review begins by examining the mechanism of CO2 methanation, detailing the advantages of photothermal catalysis over thermal or photocatalysis. Then, the reaction pathways and key intermediates involved in CO2 methanation were categorized and summarized, including the direct cleavage pathway, the reverse water-gas shift (RWGS) pathway, and the formate pathway. Subsequently, the recent advances in photothermal catalytic CO2 methanation catalysts, including oxide-supported metal catalysts, carbide-supported metal catalysts, and Metal-organic frameworks (MOFs) and their derivatives-supported metal catalysts, were systematically summarized. Finally, the future and development prospects of photothermal CO2 methanation are discussed. This review provides the latest reference for designing highly efficient photothermal CO2 methanation catalysts for the future utilization of CO2 resources.
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