Hydrothermal Stability of Mesoporous SBA-15 Modified with Alumina and Titania
| Main Authors: | Mikołajczak, Andrzej; Faculty of Chemistry, A. Mickiewicz University, Stodolny, Mikołaj; Faculty of Chemistry, A. Mickiewicz University, Łaniecki, Marek; Faculty of Chemistry, A. Mickiewicz University |
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| Format: | Article info application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
International Journal on Advanced Science, Engineering and Information Technology
, 2011
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| Subjects: | |
| Online Access: |
http://insightsociety.org/ojaseit/index.php/ijaseit/article/view/15 http://insightsociety.org/ojaseit/index.php/ijaseit/article/view/15/17 |
Daftar Isi:
- Hydrothermal stability of alumina or titania modified SBA-15 was studied. Al2O3 and TiO2 were introduced into the SBA-15 structures either by post-synthetic deposition or isomorphous substitution. Appropriate isopropoxides were applied as the reagents for modifications. In all cases surface area and pore volume on non-modified SBA-15 decreased significantly after hydrothermal treatment. Surface decreased by more than 60% after 2 hs at 975 K. Stabilization effect was found only after introduction of titanium and aluminum ions via sol-gel technique. Here, the decrease of surface area was only 20% of the initial one. Independently from the stabilization effect of the SBA-15 structure the creation of surface acidity was also possible. In contrast, the stabilization effect after isomorphous substitution was negligible. All samples were studied with XRD, TEM, nitrogen sorption at 77 K, TPD of ammonia. Hydrothermal stability was tested under water vapour at temperatures up to 975 K.