| Autor: |
Cameron E. Moak, Mica C. Smith, Mark E. Bussell, Thomas K. Pratum, Richard H. Bowker, John R. Hayes, Charles Y. Nam, Amy F. Gaudette |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
Journal of Catalysis. 276:249-258 |
| ISSN: |
0021-9517 |
| DOI: |
10.1016/j.jcat.2010.09.013 |
| Popis: |
Silica-supported rhodium phosphide (Rh 2 P/SiO 2 ) catalysts were prepared and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), 31 P solid-state NMR spectroscopy, X-ray photoelectron spectroscopy (XPS), and chemisorption measurements. XRD and TEM analysis of a 5 wt.% Rh 2 P/SiO 2 catalyst confirmed the presence of well-dispersed Rh 2 P crystallites on the silica support having an average crystallite size of 10 nm. NMR spectroscopy showed unsupported and silica-supported Rh 2 P to be metallic and XPS spectroscopy yielded a surface composition of Rh 1.94 P 1.00 that is similar to that expected from the bulk stoichiometry. The 5 wt.% Rh 2 P/SiO 2 catalyst exhibited a higher dibenzothiophene (DBT) hydrodesulfurization (HDS) activity than did Rh/SiO 2 and sulfided Rh/SiO 2 catalysts having a similar Rh loading and was also more active than a commercial Ni Mo/Al 2 O 3 catalyst. The Rh 2 P/SiO 2 catalyst showed excellent stability over a 100 h DBT HDS activity measurement and was more S tolerant than the Rh/SiO 2 catalyst. The Rh 2 P/SiO 2 catalyst strongly favored the hydrogenation pathway for DBT HDS, while the Rh/SiO 2 and sulfided Rh/SiO 2 catalysts favored the direct desulfurization pathway. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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