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  New Strategy for Chromium Substitution and Crystal Morphology ControlSynthesis and Characteristics of CrAPO-5

Kornatowski, J., Zadrozna, G., Rozwadowski, M., Zibrowius, B., Marlow, F., & Lercher, J. A. (2001). New Strategy for Chromium Substitution and Crystal Morphology ControlSynthesis and Characteristics of CrAPO-5. Chemistry of Materials, 13(12), 4447-4456. doi:10.1021/cm0011864.

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 Creators:
Kornatowski, Jan1, 2, Author              
Zadrozna, Gabriela3, Author
Rozwadowski, Michal4, Author
Zibrowius, Bodo5, Author              
Marlow, Frank6, Author              
Lercher, Johannes A.1, Author
Affiliations:
1Institute of Chemical Technology II, University of Technology, 85747 München, Germany, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
3Institute of Organic Chemistry and Technology, Cracow University of Technology, 31-155 Krakow, Poland, ou_persistent22              
4Faculty of Chemistry, Nicholas Copernicus University, 87-100 Torun, Poland, ou_persistent22              
5Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445623              
6Research Group Marlow, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445612              

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 Abstract: Additional component(s) introduced into the reaction gel allow for a stable framework substitution of Cr in significant amounts. Appropriate component(s) and metal compounds, especially those of Al, are primary factors determining the substitution. The products of the system {triethylamine−acetate ions−Cr3+ ions} have been characterized in more detail and compared with those from other synthesis procedures. The Cr heteroatoms are 4-fold bonded to the framework and their coordination is complemented by two ligands from the pores (water molecules in the calcined form) to give the favored octahedral-like coordination. The coordination can be changed reproducibly from 6 to 4 by heating the crystals over 550 K (dehydration) and vice versa by cooling (hydration). The framework Cr(III) cannot be oxidized and causes no framework charge. The reaction conditions, differing from those in the classical syntheses, enable the control of the crystal morphology. The crystals can be grown as flat hexagonal pellets of a perfect morphology with high crystallinity and sorption properties.

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Language(s): eng - English
 Dates: 2001-12-172001
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/cm0011864
 Degree: -

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Title: Chemistry of Materials
  Other : Chem. Mater.
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 13 (12) Sequence Number: - Start / End Page: 4447 - 4456 Identifier: ISSN: 0897-4756
CoNE: https://pure.mpg.de/cone/journals/resource/954925561571