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Ni/CeO2 catalysts with high CO2 methanation activity and high CH4 selectivity at low temperatures

2012; Elsevier BV; Volume: 37; Issue: 7 Linguagem: Inglês

10.1016/j.ijhydene.2011.12.122

1879-3487

Shohei Tada, Teruyuki Shimizu, Hiromichi Kameyama, Takahide Haneda, Ryuji Kikuchi,

Carbon dioxide utilization in catalysis

CO2 methanation was performed over 10 wt%Ni/CeO2, 10 wt%Ni/α-Al2O3, 10 wt%Ni/TiO2, and 10 wt%Ni/MgO, and the effect of support materials on CO2 conversion and CH4 selectivity was examined. Catalysts were prepared by a wet impregnation method, and characterized by BET, XRD, H2-TPR and CO2-TPD. Ni/CeO2 showed high CO2 conversion especially at low temperatures compared to Ni/α-Al2O3, and the selectivity to CH4 was very close to 1. The surface coverage by CO2-derived species on CeO2 surface and the partial reduction of CeO2 surface could result in the high CO2 conversion over Ni/CeO2. In addition, superior CO methanation activity over Ni/CeO2 led to the high CH4 selectivity.