Gold–Ceria SBA-15-Supported Catalyst for CO Preferential Oxidation: Surface and Reactivity Studies
| Autor: | Álvaro Reyes-Carmona, Aldo Talon, Elisa Moretti, Maurizio Lenarda, Antonio Jiménez-López, Enrique Rodríguez-Castellón |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Adsorption Science & Technology, Vol 30 (2012) |
| Druh dokumentu: | article |
| ISSN: | 0263-6174 2048-4038 |
| DOI: | 10.1260/0263-6174.30.8-9.751 |
| Popis: | In this article, the preparation and application of gold and cerium catalysts supported on zirconium-doped mesoporous silica SBA-15 was studied. These materials have been prepared by two different methods and characterized to investigate their textural properties, dispersion of the active phases and oxidation states. Both materials exhibit a marked catalytic activity. The size of the gold nanoparticles is directly related to the CO conversion rate and to the selectivity towards CO 2 exhibiting a strong temperature dependence. An X-ray photoelectron spectroscopic study of the composition and chemical state of the nanoparticles indicates the presence of Au in a metallic state. Transmission electron microscopic micrographs indicate that the best catalyst shows a higher dispersion of Au in spite of its lower gold surface content. |
| Databáze: | Directory of Open Access Journals |
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