期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 33, 页码 10463-10479出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.06.130
关键词
Copper; Ceria-zirconia; Methanol steam reforming; Cu-sintering; Coking; Regeneration
资金
- CSIR
- Department of Science and Technology, Government of India [SR/S1/PC-28/2010]
- DST
- Italian Ministry under FIRB project [RBFR10S4OW, JL1]
- Spanish Ministry under MINECO project [ENE2012-36368]
A series of ceria-zirconia solid solutions has been prepared by a surfactant assisted coprecipitation method. After impregnation of copper, their activities have been assessed for methanol steam reforming. The results indicate that the compositions with 10 and 15 at.% loading of copper on Ce0.6Zr0.4O2 exhibit maximum catalytic efficiency. Detailed structural analyses reveal high degree of copper dispersion on the ceria-zirconia matrix. In situ XPS studies confirm reduction of surface CuO species with concomitant lowering of Cu-surface atomic composition and increase of carbon. These evidences point to the formation of large aggregates of copper covered with coke that is suggested to be responsible for on stream activity loss. On regeneration, these aggregates break into a mixture of oxidized (Cu2+) and reduced (Cu-o and Cu+) copper species showing similar activity to the as prepared catalysts. In general, we have attributed catalytic activity to different proportions of copper components in the various forms of these catalysts. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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