Reverse water gas shift reaction over Co-precipitated Ni-CeO2 catalysts
来源期刊：JOURNAL OF RARE EARTHS2008年第1期
论文作者：WANG Luhui LIU Yuan ZHANG Shaoxing
Key words：reverse water gas shift reaction; nickel; CeO2; oxygen vacancy;
Abstract: The Ni-CeO2 catalysts with different Ni contents were prepared by a co-precipitation method and used for Reverse Water Gas Shift (RWGS) reaction. 2wt.%Ni-CeO2 showed excellent catalytic performance in terms of activity, selectivity, and stability for RWGS reaction. Characterizations of the catalyst samples were conducted by XRD and TPR. The results indicated that, in Ni-CeO2 catalysts, there were three kinds of nickel, nickel ions in ceria lattice, highly dispersed NiO and bulk NiO. Oxygen vacancies were formed in CeO2 lattice due to the incorporation of Ni2+ ions into ceria lattice. Oxygen vacancies formed in ceda lattice and highly dispersed Ni were key active components for RWGS, and bulk Ni was key active component for methanation of CO2.
WANG Luhui1，LIU Yuan1，ZHANG Shaoxing2
(1.Department of Catalysis Sciences and Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, China;
2.School of Chemical Engineering, Inner Mongolia University of Technology, Huhhat 010051, China)
Abstract:The Ni-CeO2 catalysts with different Ni contents were prepared by a co-precipitation method and used for Reverse Water Gas Shift (RWGS) reaction. 2wt.%Ni-CeO2 showed excellent catalytic performance in terms of activity, selectivity, and stability for RWGS reaction. Characterizations of the catalyst samples were conducted by XRD and TPR. The results indicated that, in Ni-CeO2 catalysts, there were three kinds of nickel, nickel ions in ceria lattice, highly dispersed NiO and bulk NiO. Oxygen vacancies were formed in CeO2 lattice due to the incorporation of Ni2+ ions into ceria lattice. Oxygen vacancies formed in ceda lattice and highly dispersed Ni were key active components for RWGS, and bulk Ni was key active component for methanation of CO2.
Key words:reverse water gas shift reaction; nickel; CeO2; oxygen vacancy;
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