Catalytic activity and durability of a mesoporous silica-coated Ni-alumina-based catalyst for selective CO methanation
•CO removal activity of Ni/AlVOx was dramatically improved by MS-coating.•Ni-V species were transported from Ni/AlVOx to the coating layer during preparation.•Ni-V species in the coating layer may act as active sites for CO methanation.•Fe addition to the MS-coated catalyst improved the catalyst durability.
A mesoporous silica-coated Ni-based catalyst was developed for selective CO methanation, which is a promising candidate as a new hydrogen purification process for residential polymer electrolyte fuel cell systems. The catalytic activity and CO removal ability of the Ni/AlVOx catalyst were significantly improved by the coating of mesoporous silica on the Ni/AlVOx. The Ni-V species transported from the Ni/AlVOx to the coating layer may also act as active sites for CO methanation and thus may have an essential role in the improvement of the catalytic activity. Fe addition to the catalyst was effective for the improvement of catalyst durability due to suppression of the deposition of carbonaceous species during the reaction.
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Journal: Catalysis Today - Volume 251, 1 August 2015, Pages 81–87