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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Line narrowing in H-1 MAS spectrum of mesoporous silica by removing adsorbed H2O using N-2

Cited 25 times inthomson ciCited 27 times inthomson ci
Title
Line narrowing in H-1 MAS spectrum of mesoporous silica by removing adsorbed H2O using N-2
Other Titles
Line narrowing in H-1 MAS spectrum of mesoporous silica by removing adsorbed H2O using N-2
Author
Hu, Jian ZhiKwak, JahunHerrera, Jose E.Wang, YongPeden, Charles H.F.
Keywords
MAGNETIC-RESONANCE SPECTROSCOPY; NMR-SPECTROSCOPY; SOLID CATALYSTS; PROTON NMR; RESOLUTION
Issue Date
2005-05
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
SOLID STATE NUCLEAR MAGNETIC RESONANCE, v.27, no.3, pp.200 - 205
Abstract
The peaks for silanol protons in the high-resolution H-1 NMR spectrum obtained on mesoporous silica materials may be broadened and shifted downfield by hydrogen bonding with adsorbed water molecules. Overlapping of the resonance for hydrogenbonded silanol with the corresponding broad peak due to hydrogen-bonded water may further complicate the spectrum. These complications hamper a quantitative analysis of the spectra for these and similar materials. It is demonstrated in this paper that adsorbed water can be removed by exposing the sample to dry N-2 during magic angle spinning. This results in significant line narrowing for the silanol protons in the H-1 MAS spectrum. The enhanced spectral resolution makes it possible to quantify the various hydroxyl groups in a complex metal-oxide catalyst. Results obtained on tungsten oxide supported on SBA- 15 mesoporous silica materials are reported. Additionally, the proton chemical shift of tungsten hydroxyl is identified for the first time. (C) 2004 Elsevier Inc. All rights reserved
URI
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DOI
10.1016/j.ssnmr.2004.11.004
ISSN
0926-2040
Appears in Collections:
ECHE_Journal Papers
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