New approaches to anchoring or inserting highly dispersed tungsten oxo(peroxo) species in mesoporous silicates
| Autor: | Jean-Yves Piquemal, André-Pierre Legrand, Eric Duprey, Franck Launay, Maxence Vennat, Jean-Marie Brégeault, Emmanuel Briot, Laurent Salles |
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| Rok vydání: | 2001 |
| Předmět: |
Inorganic chemistry
Cationic polymerization General Chemistry Mesoporous silica Condensed Matter Physics Heterogeneous catalysis Molecular sieve Catalysis Tetraethyl orthosilicate chemistry.chemical_compound Mesoporous organosilica chemistry Mechanics of Materials Polymer chemistry General Materials Science Mesoporous material |
| Zdroj: | Microporous and Mesoporous Materials. :409-417 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/s1387-1811(01)00215-3 |
| Popis: | The preparation of supported and/or grafted complexes involving [ n -(C 4 H 9 ) 4 N] 2 [(HPO 4 ){W 2 O 2 (μ-O 2 ) 2 (O 2 ) 2 }], denoted “PW 2 ”, and silica beads or mesoporous silica has been described and the materials characterised by 31 P NMR spectroscopy and catalysis tests. The major part of “PW 2 ” is mobile on the silica surface, but different immobilised species are formed with siliceous MCM-41. Tungsten mesoporous molecular sieves can be synthesised in acidic media by the hydrolysis of tetraethyl orthosilicate in aqueous acid, in the presence of neutral or anionic low-condensed W(VI) oxoperoxo species and a cationic surfactant. The materials have a nearly homogeneous distribution of the dopants and promising catalytic activities. |
| Databáze: | OpenAIRE |
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