Characterization and performance for propane oxidative dehydrogenation of Li-modified MoO3/Al2O3 catalysts
Oxidative dehydrogenation of propane has been studied on Mo/γ-Al 2O3 catalysts with 13wt.% of MoO3 and promoted with Li. The changes induced on catalysts when the support is doped with different amounts of Li (from 0.3 to 1.2wt.%) have been studied by BET, AAS, XRD, SEM-EDAX, TPR, DRS, XPS, Raman sp...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2003 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/57844 |
| Acceso en línea: | http://hdl.handle.net/11336/57844 |
| Access Level: | acceso abierto |
| Palabra clave: | Li-Doped Mo/Γ-Al2o3 Catalysts Propane Oxidative Dehydrogenation Raman https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 |
| Sumario: | Oxidative dehydrogenation of propane has been studied on Mo/γ-Al 2O3 catalysts with 13wt.% of MoO3 and promoted with Li. The changes induced on catalysts when the support is doped with different amounts of Li (from 0.3 to 1.2wt.%) have been studied by BET, AAS, XRD, SEM-EDAX, TPR, DRS, XPS, Raman spectroscopy and isopropanol decomposition. The characterization of the samples showed important changes in: texture, Mo supported structure, acid-base properties and reducibility. The Li replaces Brønsted acid sites and decreases the strength of the terminal Mo=O bond. The change in the strength of the terminal Mo=O bond does not correlate with the decrease in Mo species reducibility or with the decrease in propane conversion. This behavior suggests that the terminal Mo=O bond is not the active sites for ODH of propane. The selectivity to propene increases at lower conversion whereas at higher values it leveled off around 25%. |
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