2 and Ni–Ce 0.8Zr 0.2O 2 Catalysts for CO 2 Methanation]]>

摘要

Herein, we studied the influence of calcination temperature (500–800?°C) of Ni/CeO~(2)and Ni/Ce~(0.8)Zr~(0.2)O~(2)catalysts on the specific surface area, pore volume, crystalline size, lattice parameter, chemical bonding and oxidation states, nickel dispersion and CH~(4)/CO production rate in CO~(2)methanation. In general, the catalytic performance revealed that Zr doping catalysts could increase the CH~(4)production rate. Combined with the production rate and the characterizations results, we found that the combination of nickel dispersion, peak area of CO~(2)–TPD and O~(II)/(O~(II)+ O~(I))) play the critical role in increasing the CH~(4)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.