Effect of support calcination temperature on the catalytic properties of Ru/Ce0.8Zr0.2O2 for methanation of carbon dioxide

A series of Ru/Ce0.8Zr0.2O2 catalysts were prepared by the impregnation method with Ce0.8Zr0.2O2 homoprecipitated and calcined at different temperatures as supports. The supports and the catalysts were characterized with TG-DSC, BET and H2-TPR techniques. It was shown that the Ce0.8Zr0.2O2 calcined at 500°C formed Ce-Zr solid solution and had a proper surface area and pore opening and a weak interaction with Ru species, leading to a significant increase in the catalytic activity. A suitable reduction methods promoted distribution of active species. The Ru/Ce0.8Zr0.2O2 prepared with the Ce0.8Zr0.2O2 calcined at 500°C showed high activity after calcination at 400°C and successive reduction with H2N·NH2·H2O and H2. It gave a H2 conversion of 93.57%, approaching to the equilibrium value under the conditions of 290°C, 0.1 MPa, 10000 h−1 and H2/CO2 molar ratio of 3.5.