CO 2 methanation on the catalyst of Ni/MCM-41 promoted with CeO 2 .

CO2 as a raw feed combined with renewable hydrogen for the production of useful chemicals and alternative energy products is one of the solutions to environmental and energy problems. In this study, a series of Ni-xCeO2 /MCM-41 catalysts with a nickel content of 20wt% were prepared through deposition precipitation method for CO2 methanation. Different characterization methods, including BET, XRD, TEM, SEM, H2 -TPR and H2 -TPD were applied to help explore the influence mechanism of CeO2 on Ni/MCM-41 in CO2 methanation. It was found that all CeO2 -promoted catalysts exhibited enhanced catalytic activity when compared to Ni/MCM-41. The catalyst modified with 20wt% CeO2 showed the best catalytic performance, with CO2 conversion and CH4 selectivity of 85.6% and 99.8%, respectively, at the temperature of 380°C under atmospheric pressure. The synergetic effects among Ni0 active sites, the promoter and the support, including nickel dispersion improvement and increased CO2 adsorption sites due to the addition of CeO2 , were considered as important factors for high reactivity of the promoted catalysts. The stability test showed that the promoted catalyst maintained its high reactivity after 30h.