Influence of Calcination Temperature on Activity and Selectivity of Ni–CeO2 and Ni–Ce0.8Zr0.2O2 Catalysts for CO2 Methanation
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Herein, we studied the influence of calcination temperature (500–800 °C) of Ni/CeO2 and Ni/Ce0.8Zr0.2O2 catalysts on the specific surface area, pore volume, crystalline size, lattice parameter, chemical bonding and oxidation states, nickel dispersion and CH4/CO production rate in CO2 methanation. In general, the catalytic performance revealed that Zr doping catalysts could increase the CH4 production rate. Combined with the production rate and the characterizations results, we found that the combination of nickel dispersion, peak area of CO2–TPD and OII/(OII + OI)) play the critical role in increasing the CH4 production rate. It is well to be mentioned that the CO production rate is strongly influenced by the nickel dispersion. Furthermore, the in-situ DRIFTS confirmed that the CO originates from the decomposition of H-assisted formate species.
KeywordsCO2 methanation Ni/CeO2 Ni/Ce0.8Zr0.2O2 Calcination temperature In-situ DRIFTS
This work was financially supported by the National University of Singapore and NEA Project (ETRP 1501103, R279-000-491-279), A*STAR for the funding from AME IRG 2017 Project R279-000-509-305, Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province (BY2016004-09), Jiangsu Province Scientific and Technological Achievements into a Special Fund Project (BA2015062, BA2016055 and BA2017095), A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education of Jiangsu Higher Education Institutions. Yang Yu would like to thank the China Scholarship Council for financially supporting his Ph.D. work.