首页|Zonal activation of molecular carbon dioxide and hydrogen over dual sites Ni-Co-MgO catalyst for CO2 methanation:Synergistic catalysis of Ni and Co species
Zonal activation of molecular carbon dioxide and hydrogen over dual sites Ni-Co-MgO catalyst for CO2 methanation:Synergistic catalysis of Ni and Co species
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An in-depth mechanism in zonal activation of CO2 and H2 molecular over dual-active sites has not been revealed yet.Here,Ni-Co-MgO was rationally constructed to elucidate the CO2 methanation mechanism.The abundant surface nickel and cobalt components as active sites led to strong Ni-Co interaction with charge transfer from nickel to cobalt.Notably,electron-enriched Coδ-species participated in efficient chemisorption and activation of CO2 to generate monodentate carbonate.Simultaneously,plentiful avail-able Ni0 sites facilitated H2 dissociation,thus CO2 and H2 were smoothly activated at zones of Coδ-species and Ni0,respectively.Detailed in situ DRIFTS,quasi situ XPS,TPSR,and DFT calculations substantiated a new formate evolution mechanism via monodentate carbonate instead of traditional bidentate carbonate based on synergistic catalysis of Coδ-species and Ni0.The zonal activation of CO2 and H2 by tuning elec-tron behaviors of double-center catalysts can boost heterogeneous catalytic hydrogenation performance.
Zonal activationCO2 methanationDual active sitesSynergistic effect
Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China
National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries,Kunming University of Science and Technology,Kunming 650500,Yunnan,China
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China
Science and Technology Project of Southwest United Graduate School of Yunnan Province国家自然科学基金
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