| Autor: |
Hueso Martos, José Luis, Martínez Martínez, D., Caballero Martínez, Alfonso, Rodríguez González-Elipe, Agustín, Mun, B. S., Salmeron, Miquel |
| Přispěvatelé: |
Universidad de Sevilla. Departamento de Química Inorgánica, Ministerio de Educación y Ciencia (MEC). España, Department of Energy. United States |
| Jazyk: |
angličtina |
| Rok vydání: |
2009 |
| Předmět: |
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| Popis: |
We have studied the oxidation of carbon monoxide over a lanthanum substituted perovskite (La0.5Sr0.5CoO3-d) catalyst prepared by spray pyrolysis. Under the assumption of a first-order kinetics mechanism for CO, it has been found that the activation energy barrier of the reaction changes from ∼80 to ∼40 kJ mol-1 at a threshold temperature of ca. 320 °C. In situ XPS near-ambient pressure (∼0.2 torr) shows that the gas phase oxygen concentration over the sample decreases sharply at ca. 300 °C. These two observations suggest that the oxidation of CO undergoes a change of mechanism at temperatures higher than 300 °C. Ministerio de Educación y Ciencia ENE2004-01660, ENE2007-67926-C2-01 US Department of Energy DE-AC02- 05CH11231 |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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