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

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• 作者：Shohei Tada^a ; Teruyuki Shimizu^a ; Hiromichi Kameyama^b ; Takahide Haneda^b ; Ryuji Kikuchi^a ; ^{rkikuchi@chemsys.t.u-tokyo.ac.jp}
• 关键词：Ni/CeO2 ; Ni/伪-Al2O3 ; Ni/TiO2 ; Ni/MgO ; CO2 methanation ; CH4 selectivity
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：7
• 页码：5527-5531
• 文件大小：437 K

摘要

CO₂ methanation was performed over 10聽wt%Ni/CeO₂, 10聽wt%Ni/伪-Al₂O₃, 10聽wt%Ni/TiO₂, and 10聽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/伪-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.