The Ni/ZrOb>2b> catalyst and the methanation of CO and COb>2b>

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• 作者：Daniela C.D. da Silva^a ; ^b ; Sonia Letichevsky^a ; Luiz E.P. Borges^b ; Lucia G. Appel^a ; ^{lucia.appel@int.gov.br}
• 关键词：Methanation ; Zirconia ; Nickel ; Carbon monoxide ; Carbon dioxide
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：June, 2012
• 卷：37
• 期：11
• 页码：8923-8928
• 文件大小：394 K

摘要

The Ni/ZrOb>2b> catalyst is one of the most active systems for the methanation of CO to be employed in the hydrogen purification for PEMFC. This contribution aims to study the effect of ZrOb>2b> on the methanation of CO and COb>2b>. The catalytic behavior of Ni/ZrOb>2b>, Ni/SiOb>2b>, a physical mixture comprising Ni and ZrOb>2,b> and a double-bed reactor were evaluated. The TPD of CO and COb>2b>, TPSR and the cyclohexane dehydrogenation reaction were carried out to describe the catalysts and the reactions. The high activity of Ni/ZrOb>2b> catalyst toward the methanation of CO is related to the presence of active sites on the ZrOb>2b> surface. The methanation of CO occurs on ZrOb>2b> due to its ability to adsorb CO and also because of the hydrogen spillover phenomenon. Apparently, the effect of ZrOb>2b> is less relevant for the methanation of COb>2b>. Ni/ZrOb>2b> is a very promising system for the purification of hydrogen.