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  The synthesis of zeolites from dry powders

Althoff, R., Reitmaier, S., Schmidt, W., Zibrowius, B., Unger, K., & Schüth, F. (1995). The synthesis of zeolites from dry powders. Studies in Surface Science and Catalysis, 98, 36-37. doi:10.1016/S0167-2991(06)81074-8.

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Althoff, R.1, 2, Author
Reitmaier, S.1, 2, Author
Schmidt, W.1, 2, 3, Author              
Zibrowius, B.1, 2, 4, Author              
Unger, K.K.1, 2, Author
Schüth, F.1, 2, 5, Author              
Affiliations:
1Institut für Anorganische Chemie und Analytische Chemie der Johannes Gutenberg-Universität Mainz, ou_persistent22              
2Institut für Brennstoffchemie und physikalisch-chemische Verfahrenstechnik der RWTH Aachen, ou_persistent22              
3Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445618              
4Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445623              
5Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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 Abstract: ZSM-5 was synthesized by different methods with a gradually decreasing water content ending in a reaction mixture with absolutely dry reagents in form of a powder in the complete absence of a solution phase. Amorphous precursors obtained by drying SiO2*Al2O3 gels at 650°C were transformed into zeolites in the presence of dried NH4F and TPABr. The reaction products were characterized by XRD, REM, TG/DTA, MAS NMR and Electron Micropobe. Pure ZSM-5 or Silicalite-1 was obtained in all cases. Some water is probably formed as a reaction product, but the maximum water pressure is appreciably below the saturation pressure at the given reaction conditions. To explain the formation of a zeolite, we suggest a vapor phase mass transfer process with SiF4 as the mobile species between the solid phase which contains the amorphous Si/Al-precursor and the formed zeolite.

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Language(s): eng - English
 Dates: 2007-06-211995
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/S0167-2991(06)81074-8
 Degree: -

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Title: Studies in Surface Science and Catalysis
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 98 Sequence Number: - Start / End Page: 36 - 37 Identifier: ISSN: 0167-2991
CoNE: https://pure.mpg.de/cone/journals/resource/954926964942_2