The use of TiO2—Al2O3 binary oxides as supports for Mo-based catalysts in hydrodesulfurization of thiophene and dibenzothiophene
| Autor: | E. Olguin, M. Vrinat, L. Ceden˜o, J. Ramirez, M. Borque, A. López-Agudo |
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| Přispěvatelé: | Institut de recherches sur la catalyse (IRC), Centre National de la Recherche Scientifique (CNRS), IRCELYON, ProductionsScientifiques |
| Rok vydání: | 1997 |
| Předmět: |
Thermal desorption spectroscopy
Process Chemistry and Technology Inorganic chemistry [CHIM.CATA] Chemical Sciences/Catalysis chemistry.chemical_element [CHIM.CATA]Chemical Sciences/Catalysis 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Electron spectroscopy Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Dibenzothiophene Thiophene 0210 nano-technology Cobalt Hydrodesulfurization |
| Zdroj: | Applied Catalysis A : General Applied Catalysis A : General, Elsevier, 1997, 165, pp.1-13 |
| ISSN: | 0926-860X |
| DOI: | 10.1016/s0926-860x(97)00184-1 |
| Popis: | Molybdenum, cobalt-molybdenum and nickel-molybdenum catalysts were prepared over mixed TiO 2 —Al 2 O 3 oxides containing between 0 and 100% TiO 2 . The supports and samples were characterized in their oxidic or sulfide state by BET, X-Ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), temperature programmed desorption of ammonia, X-Ray photo electron spectroscopy (XPS) and high resolution electron microscopy (HREM). The three series of catalysts were evaluated in the hydrodesulfurization of thiophene at atmospheric pressure and dibenzothiophene under 45 × 10 5 Pa. The results provided evidence for a support effect on the catalytic activities of the sulfided catalysts. For low or intermediate TiO 2 content in the support, a loss of cobalt in the Al 2 O 3 leads to a decrease of activity (compared to the pure Al 2 O 3 supported samples), but for x =TiO 2 /[TiO 2 +Al 2 O 3 ] higher than 0.8, the support effect improved the HDS activity. Moreover, the observed variations in activity depended on the nature of the model molecule used in the catalytic test and/or on the experimental conditions (H 2 or H 2 S partial pressure). These points are discussed in relation to the mechanisms of the reactions. |
| Databáze: | OpenAIRE |
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