Ultrastable MSU-G molecular sieve catalysts with a lamellar framework structure and a vesicle-like particle texture
✍ Scribed by Seong-Su Kim; Yu Liu; Thomas J. Pinnavaia
- Book ID
- 104430384
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 356 KB
- Volume
- 44-45
- Category
- Article
- ISSN
- 1387-1811
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✦ Synopsis
A mesoporous MSU-G molecular sieve silica, prepared through a H bonding assembly mechanism in the presence of a C 12 H 25 NH(CH 2 ) 2 NH 2 gemini surfactant as the structure director, is shown on the basis of N 2 and XRD measurements to be substantially more stable to calcination at 1000°C and to hydrothermal treatment at 100°C than electrostatically assembled MCM-41, KIT-1 and SBA-3 silicas. Also, 2%Al-MSU-G derivatives as prepared through grafting reactions with aluminum nitrate, aluminum iso-butoxide or sodium aluminate, are far more ecient acid catalysts than 2%Al-MCM-41 for the conversion of 2,4-di-tert-butylphenol and cinnamyl alcohol to a bulky ¯avan as the primary alkylation product. The exceptional stability of MSU-G mesostructures is consistent with the very high degree of framework cross-linking Q 4 =Q 3 6:2 and thick framework walls ($25 A). The improved catalytic activity of MSU-G mesostructures is attributable to the vesicular particle morphology, which facilitates reagent access to catalytic centers in the lamellar framework.