Methanol steam reforming behavior of copper impregnated over CeO2-ZrO2 derived from a surfactant assisted coprecipitation route
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 Ce0.6Zr0.4...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/79996 |
| Acceso en línea: | https://hdl.handle.net/2117/79996 https://dx.doi.org/10.1016/j.ijhydene.2015.06.130 |
| Access Level: | acceso abierto |
| Palabra clave: | Steam Copper alloys Methanol Zirconium alloys Copper Ceria-zirconia Methanol steam reforming Cu-sintering Coking Regeneration Oxygen storage capacity Hydrogen-production Cuo/zno/ceo2/zro2/al2o3 catalysts Cu/zno/al2o3 catalysts Support material Oxide catalysts Zirconia Ceria Deactivation Hydrocarbons Vapor Coure--Aliatges Metanol Zirconi--Aliatges Àrees temàtiques de la UPC::Energies Àrees temàtiques de la UPC::Enginyeria dels materials |
| Sumario: | 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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