Zr and Fe on Pt/CeO2-MOx/Al2O3 catalysts for WGS reaction
By evaluating the functional modifications induced by Zr and Fe as dopants in Pt/CeO2-MOx/Al2O3 catalysts (M = Fe and Zr), the key features for improving water gas shift (WGS) performance for these systems have been addressed. Pt/ceria intrinsic WGS activity is often related to improved H2 surface d...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/367946 |
| Acceso en línea: | http://hdl.handle.net/10261/367946 https://api.elsevier.com/content/abstract/scopus_id/85102889357 |
| Access Level: | acceso abierto |
| Palabra clave: | Doped ceria Fe H2-TPD Pt/ceria catalysts WGS reaction WGS-TPSR Zr Composite materials |
| Sumario: | By evaluating the functional modifications induced by Zr and Fe as dopants in Pt/CeO2-MOx/Al2O3 catalysts (M = Fe and Zr), the key features for improving water gas shift (WGS) performance for these systems have been addressed. Pt/ceria intrinsic WGS activity is often related to improved H2 surface dynamics, H2O absorption, retentions and dissociation capacities which are influenced greatly by the support nature. Two metals, iron and zirconia, were chosen as ceria dopants in this work, either in separate manner or combined. Iron incorporation resulted in CO-redox properties and oxygen storage capacities (OSC) improvement but the formation of Ce-Fe solid solutions did not offer any catalytic benefit, while the Zr incorporation influenced in a great manner surface electron densities and shows higher catalytic activity. When combined both metals showed an important synergy evidenced by 30% higher CO conversions and attributed to greater surface electron densities population and therefore absorption and activity. This work demonstrates that for Pt/ceria catalysts OSC enhancement does not necessarily imply a catalytic promotion. |
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