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  FTIR microscopy with polarized IR radiation for the analysis of SAPO-5 and p-xylene-loaded SAPO-5

Schüth, F., Demuth, D., Zibrowius, B., Kornatowski, J., & Finger, G. (1994). FTIR microscopy with polarized IR radiation for the analysis of SAPO-5 and p-xylene-loaded SAPO-5. Journal of the American Chemical Society, 116(3), 1090-1095. doi:10.1021/ja00082a035.

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 Creators:
Schüth, F.1, 2, Author              
Demuth, D.1, 2, Author              
Zibrowius, B.3, 4, Author              
Kornatowski, J.2, 5, Author              
Finger, G.6, Author
Affiliations:
1Institut fir Anorganische Chemie und Analytische Chemie der Johannes Gutenberg- Universität Mainz. W-6500 Mainz, Germany, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
3University of Manchester Institute of Science and Technology, Manchester, M6OIQD England, ou_persistent22              
4Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445623              
5Institut für Kristallographie der Johann- Wolfgang-Goethe-Universität Frankfurt, W-6000 Frankfurt, German, ou_persistent22              
6Zentrum fur Heterogene Katalyse, 0-1199 Berlin, Germany , ou_persistent22              

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 Abstract: Using an optimized procedure, large SAPO-5 single crystals (up to 250 X 75 µm) with a very high optical quality could be synthesized. NMR spectroscopy proved the perfect incorporation of silicon on phosphorus sites. IR microscopy with polarized IR radiation revealed that both types of OH groups, with absorption bands at 3627 and 3519 cm-1, are oriented almost perpendicularly to the crystal c-axis, thus protruding into the 12-membered and the 6-membered ring channels, respectively. Adsorbed p-xylene reacts with both types of OH groups, giving rise to one broad band for the OH vibration at 3233 cm-1, which indicates a shift of the proton from the 6-membered ring to the 12-membered ring. From the dichroic ratios of the bands due to the p-xylene, it can be inferred that the long axis of the p-xylene molecule is oriented parallel to the channel axis of the molecular sieve.

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Language(s): eng - English
 Dates: 1994-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/ja00082a035
 Degree: -

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Title: Journal of the American Chemical Society
  Other : J. Am. Chem. Soc.
  Abbreviation : JACS
Source Genre: Journal
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Publ. Info: American Chemical Society
Pages: - Volume / Issue: 116 (3) Sequence Number: - Start / End Page: 1090 - 1095 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870