Alkene and thioether oxidations with H2O2 over Ti- and V-containing mesoporous mesophase catalysts
| Autor: | Natalia Trukhan, A. Yu. Derevyankin, Oxana A. Kholdeeva, V.N. Romannikov, A.N. Shmakov, E.A. Paukshtis |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Materials science Alkene Thioanisole Inorganic chemistry Vanadium chemistry.chemical_element General Chemistry Condensed Matter Physics Catalysis chemistry.chemical_compound Thioether chemistry Mechanics of Materials General Materials Science Atomic ratio Mesoporous material Titanium |
| Zdroj: | Microporous and Mesoporous Materials. :603-608 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/s1387-1811(01)00240-2 |
| Popis: | Well-organized Ti- and V-containing silicate mesoporous mesophase materials (MMM) were synthesized using C 16 H 33 N(CH 3 ) 3 Br and characterized by elemental analysis, IR, DRS-UV, XRD, and N 2 adsorption. Catalytic properties of these materials in alkene and thioether oxidations with aqueous H 2 O 2 were examined. The structure–activity study was performed for the C16-(Ti,Si)-MMM catalysts with the Si/Ti atomic ratio ranged from 19 to 166. The samples with the Si/Ti atomic ratio in the range of 49–124 showed the highest catalytic activities. Both structure perfection of the silicate matrix and degree of isolation of titanium ions in it appeared to be crucial factors determining catalytic activity of C16-(Ti,Si)-MMM in alkene oxidation. For efficient oxidation of more nucleophilic substrates (thioethers) the structural perfection of the C16-(Ti,Si)-MMM catalysts was less important. No titanium leaching occurred even in 1.1 M H 2 O 2 solution at 353 K, whereas vanadium leaching was already pronounced at [H 2 O 2 ]=0.05 M and room temperature. The oxidation processes proved to be true heterogeneous for C16-(Ti,Si)-MMM and mostly homogeneous for C16-(V,Si)-MMM. |
| Databáze: | OpenAIRE |
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