| Autor: |
Charles S. Spanjers, Ji Woong Chang, Paul J. Cordeiro, Meg E. Fasulo, T. Don Tilley, Pascal Guillo, Robert M. Rioux, Mike I. Lipschutz |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
ACS Catalysis. 3:2269-2279 |
| ISSN: |
2155-5435 |
| DOI: |
10.1021/cs400529x |
| Popis: |
The complex Ti[OGeiPr3]4 (1), prepared via the reaction of Ti(OiPr)4 with iPr3GeOH, represents a useful structural and spectroscopic model for titanium–germanium species dispersed onto silica. This precursor was used to introduce site-isolated Ti(IV) centers onto the surface of a mesoporous SBA15 support via the thermolytic molecular precursor method. The local environments of the supported materials (TiGe3SBA15 and calcined TiGe3SBA15-O2) were studied by various spectroscopic methods, including X-ray absorption spectroscopy. These materials are active catalysts for the epoxidation of cyclic and terminal olefins with alkyl hydroperoxides under anhydrous conditions. Compared to catalysts synthesized from siloxide-only precursors, the new catalysts produce 2–3 times more product after 9 h under identical reaction conditions for the epoxidations of cyclohexene and 1-octene. The new materials did not significantly leach under reaction conditions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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