Ceria as a new support of noble metal catalysts for hydrocarbon reactions: chemisorption and catalytic studies
| Autor: | K. Matusek, Detre Teschner, Attilla Wootsch, T. Röder, Zoltán Paál |
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| Rok vydání: | 2001 |
| Předmět: |
Inorganic chemistry
chemistry.chemical_element General Chemistry engineering.material Condensed Matter Physics Rhodium Catalysis chemistry.chemical_compound chemistry Transition metal Chemisorption Hydrogenolysis engineering General Materials Science Noble metal Temperature-programmed reduction Methylcyclopentane |
| Zdroj: | Solid State Ionics. :709-713 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/s0167-2738(01)00784-6 |
| Popis: | Metal/cerium-oxide systems were practically not studied in hydrocarbon reactions. Chemisorption properties—in temperature programmed reduction, hydrogen adsorption, and H2/O2 titration—and catalytic behavior of ceria-supported Pt and Rh catalysts with different metal loadings and with two pre-reduction temperatures (LTR, TR=573 K and HTR, TR=773 K) were investigated. Pt/CeO2 was tested in transformation of n-hexane while Rh/CeO2 in ring opening of methylcyclopentane (MCP). Higher spillover activity was found for the LTR Rh samples than for HTR ones. The opposite was true for Pt. The Rh/ceria samples showed ordinary catalytic behavior: structure insensitivity was observed for the first CC bond cleavage of MCP on Rh/ceria and the further reaction of the ring opening intermediates was affected by the surface hydrogen concentration. The Pt/LTR samples showed catalytic properties similar to EUROPT-1, while the HTR samples were different, namely the higher spillover activity caused high C5-cyclization selectivity on the catalyst with low metal loading, and surprisingly high hydrogenolysis selectivity on that with higher metal loading. |
| Databáze: | OpenAIRE |
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