Post-synthesis alumination of SBA-15 in aqueous solution: A versatile tool for the preparation of acidic Al-SBA-15 supports
| Autor: | Michele Breysse, Shuangqin Zeng, Juliette Blanchard, Yahua Shi, Dadong Li, Hong Nie, Xingtian Shu |
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| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Materials science Aqueous solution Inorganic chemistry chemistry.chemical_element General Chemistry Decane Polymer Condensed Matter Physics Post synthesis Heterogeneous catalysis Grafting Hydrolysis chemistry.chemical_compound chemistry Mechanics of Materials Aluminium General Materials Science |
| Zdroj: | Microporous and Mesoporous Materials. 85:297-304 |
| ISSN: | 1387-1811 |
| Popis: | Al-SBA-15 supports were prepared by post-synthesis alumination in aqueous solution of a pure silica SBA-15 material. The effects of the aluminium concentration [Al], and of the hydrolysis ratio h = [TMAOH]/[Al] on the speciation of aluminium ([Al(H2O)6]3+, [Al13O4(OH)24(H2O)20]7+, aluminium polymers) in the solution were examined. Depending on h and [Al], samples with various Si/Al ratios and acidities were obtained. The effects of h and [Al] on the characteristics of the final material were assigned to the speciation of the aluminium in the alumination solution: a correlation between the species present in solution and the Si/Al ratio in the final materials leads us to propose that [Al13O4(OH)24(H2O)20] is the most reactive and effective species toward grafting on the silica surface. |
| Databáze: | OpenAIRE |
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