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Título: | Iron-modified ceria and Au/ceria catalysts for Total and Preferential Oxidation of CO (TOX and PROX) |
Autor: | Laguna, Óscar H. CSIC ORCID; Centeno, Miguel Ángel CSIC ORCID; Arzamendi, G.; Gandía, L.M.; Romero Sarria, Francisca CSIC ORCID; Odriozola, José Antonio CSIC ORCID | Palabras clave: | Gold catalysts Iron doped ceria CO abatement Preferential Oxidation (PROX) Total Oxidation (TOX) |
Fecha de publicación: | 2010 | Editor: | Elsevier | Citación: | Catalysis Today 157: 155- 159 (2010) | Resumen: | Iron-modified ceria supports containing different molar percentages of Fe (0%, 10%, 25%, and 50%) were synthesized by thermal decomposition of the metal propionates. The formation of a Ce-Fe oxide solid solution is evidenced through XRF, XRD, BET and Raman spectroscopy. For iron contents above 25% the formation of ¿-Fe2O3 was detected, pointing out the formation of the isolated oxides. The catalytic activity of the Fe-modified catalysts in the Total Oxidation of CO reaction (TOX) is higher than for the bare CeO 2 material. The synergy between Ce and Fe shows a maximum for 10% Fe content (CeFe10), catalyst that shows the highest CO conversion per atom of Fe incorporated. Gold catalyst was also prepared on CeFe10 and its catalytic activity compared with Au/CeO2 catalyst. The addition of iron to the gold catalyst resulted in an enhancement of the catalytic activity for CO oxidation especially at low temperature. This Au/CeFe10 catalyst was also active and selective with excellent stability in the Preferential Oxidation of CO (PROX) showing a higher CO conversion than the Au/CeO2 catalyst at temperatures below 150 °C being hardly affected by the presence of CO 2 and H2O in the gas stream. | URI: | http://hdl.handle.net/10261/123789 | DOI: | 10.1016/j.cattod.2010.04.011 | Identificadores: | doi: 10.1016/j.cattod.2010.04.011 issn: 0920-5861 |
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