Mesoporous aluminum silicate catalyst with single-type active sites: Characterization by solid-state NMR and studies of reactivity for Claisen rearrangement reactions

TitleMesoporous aluminum silicate catalyst with single-type active sites: Characterization by solid-state NMR and studies of reactivity for Claisen rearrangement reactions
Publication TypeJournal Article
Year of Publication2007
AuthorsCai Y, Kumar R, Huang W, Trewyn BG, Wiench JW, Pruski M, Lin VSY
Journal TitleJournal of Physical Chemistry C
Volume111
Pages1480-1486
Date PublishedJan
Type of ArticleArticle
ISBN Number1932-7447
Accession NumberISI:000245005400064
KeywordsALUMINOSILICATES, CHEMICAL-SHIFTS, FRAMEWORK ALUMINUM, MOLECULAR-SIEVE MCM-41, POST-SYNTHESIS ALUMINATION, QUADRUPOLAR NUCLEI, spectroscopy, stability, STRUCTURAL ALUMINUM, zeolite
Abstract

A mesoporous aluminum silicate (Al-MS) material has been successfully synthesized via a base-catalyzed co-condensation reaction. Solid-state NMR studies showed that the aluminum atoms are tetrahedrally coordinated and are stable up to at least 400 degrees C. The double resonance Al-27-Si-29 NMR experiment provided first direct evidence that all At atoms are surrounded by Si atoms forming Al-O-Si bonds in the framework. The silicon to aluminum atomic ratio at the surface (Si/Al)s is estimated at around 100, which exceeds the overall Si/Al ratio of 60. Reactivity study of the mesoporous aluminosilicate shows an excellent catalytic reactivity for the Claisen rearrangement of allyl phenyl ether despite the low surface concentration of Al.

DOI10.1021/jp0659913
Alternate JournalJ. Phys. Chem. C