Article
Near-ambient X-ray photoemission spectroscopy and kinetic approach to the mechanism of carbon monoxide oxidation over lanthanum substituted cobaltites
Author/s | Hueso Martos, José Luis
Martínez Martínez, D. Caballero Martínez, Alfonso ![]() ![]() ![]() ![]() ![]() ![]() ![]() Rodríguez González-Elipe, Agustín Mun, B. S. Salmeron, Miquel |
Department | Universidad de Sevilla. Departamento de Química Inorgánica |
Publication Date | 2009 |
Deposit Date | 2022-07-05 |
Published in |
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Abstract | 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 ... 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. |
Funding agencies | Ministerio de Educación y Ciencia (MEC). España Department of Energy. United States |
Project ID. | ENE2004-01660
![]() ENE2007-67926-C2-01 ![]() DE-AC02- 05CH11231 ![]() |
Citation | Hueso Martos, J.L., Martínez Martínez, D., Caballero Martínez, A., Rodríguez González-Elipe, A., Mun, B.S. y Salmeron, M. (2009). Near-ambient X-ray photoemission spectroscopy and kinetic approach to the mechanism of carbon monoxide oxidation over lanthanum substituted cobaltites. Catalysis Communications, 10 (14), 1898-1902. |
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