Microstructure of silica monolayer solid acid catalysts determined by 29Si NMR spectroscopy

Microstructure of silica monolayer solid acid catalysts determined by 29Si NMR spectroscopy The nuclear magnetic resonance (NMR) of 29Si showed that the silica monolayer, which was prepared by chemical vapor deposition (CVD) of Si(OCH3)4 at 593 K on alumina, mainly consisted of Si(OAl)1(OSi)3 and Si(OAl)1(OSi)2(OH)1 species, in agreement with the mechanism of formation of monolayer. The Brønsted acid site is suggested to be the latter species. On the other hand, such an isolated species as Si(OAl)3(OH)1 was formed from Si(OCH3)(CH3)3. Lack of acidity on this species indicates that the acidity requires the siloxane network. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Microstructure of silica monolayer solid acid catalysts determined by 29Si NMR spectroscopy

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Publisher
Springer Netherlands
Copyright
Copyright © 1998 by Springer
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856798X00014
Publisher site
See Article on Publisher Site

Abstract

The nuclear magnetic resonance (NMR) of 29Si showed that the silica monolayer, which was prepared by chemical vapor deposition (CVD) of Si(OCH3)4 at 593 K on alumina, mainly consisted of Si(OAl)1(OSi)3 and Si(OAl)1(OSi)2(OH)1 species, in agreement with the mechanism of formation of monolayer. The Brønsted acid site is suggested to be the latter species. On the other hand, such an isolated species as Si(OAl)3(OH)1 was formed from Si(OCH3)(CH3)3. Lack of acidity on this species indicates that the acidity requires the siloxane network.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Apr 15, 2009

References

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