Mesoporous silica directly modified by incorporation or impregnation of some heteropolyacids: Synthesis and structural characterization
| Autor: | Erne E. Kiss, R. Marinkovic-Neducin, Ivanka Holclajtner-Antunović, Viorel Sasca, Alexandru Popa |
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| Rok vydání: | 2011 |
| Předmět: |
Thermogravimetric analysis
Materials science Mechanical Engineering Inorganic chemistry Cationic polymerization 02 engineering and technology Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Mesoporous organosilica Keggin structure chemistry.chemical_compound symbols.namesake Chemical engineering chemistry Mechanics of Materials Differential thermal analysis symbols General Materials Science Thermal stability 0210 nano-technology Raman spectroscopy |
| Zdroj: | Materials Research Bulletin. 46:19-25 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2010.10.003 |
| Popis: | The synthesis of heteropolyacids–mesoporous silica composites was carried out in acidic media by impregnation and/or by direct incorporation of active phase. The effect of incorporation of heteropolyacids (HPAs) species into organized mesoporous silica was studied by using non-ionic and cationic surfactants. A comparison between direct incorporation of HPAs into mesoporous silica and impregnation of HPAs on mesoporous silica was done. The structure and texture of H3PMo12O40 and H4PVMo11O40 included on mesoporous silica were studied by XRD, SEM–EDS, FT-IR and Raman spectroscopies and BET and pore size distribution. Thermal stability was determined by thermo gravimetric analysis (TGA) and differential thermal analysis (DTA). FT-IR and Raman studies showed that HPAs anions preserved their Keggin structure after incorporation or impregnation on mesoporous silica support. |
| Databáze: | OpenAIRE |
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