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  Oxidation behavior of ferrous cations during ion exchange into zeolites under atmospheric conditions

Weidenthaler, C., Zibrowius, B., Schimanke, J., Mao, Y., Mienert, B., Bill, E., et al. (2005). Oxidation behavior of ferrous cations during ion exchange into zeolites under atmospheric conditions. Microporous and Mesoporous Materials, 84(1-3), 302-317. doi:10.1016/j.micromeso.2005.04.022.

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 Creators:
Weidenthaler, Claudia1, Author              
Zibrowius, Bodo2, Author              
Schimanke, Julia1, Author
Mao, Yachun1, Author              
Mienert, Bernd3, Author
Bill, Eckhard3, Author
Schmidt, Wolfgang1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Service Department Mynott (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445627              
3Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany, ou_persistent22              

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Free keywords: Ion exchange; Zeolite A, X, Y; MAS NMR; Mössbauer spectroscopy; XPS; XRD
 Abstract: During ion exchange under atmospheric conditions, zeolites A, X, and Y facilitate the oxidation of Fe2+ to Fe3+ to very different extents, ranging from complete oxidation of the ferrous cations to ferric species to almost complete preservation of the ferrous state. Drying the exchanged zeolites at elevated temperature favors the oxidation reaction. The chemical environments of the low-silica zeolites A and X seem to promote the oxidation reaction more strongly than that of the more siliceous zeolite Y. Iron-rich surface layers are formed on the external surface of the zeolite particles, resulting in an apparent over-exchange especially for the low-silica zeolites. The structural integrity of the zeolite samples is differently affected by the exchange in the weakly acidic exchange solutions. The observed structural damage ranges from an almost unaffected framework, as observed for zeolite Y after one exchange, to structural collapse, as observed for zeolite X after repeated exchanges.

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Language(s): eng - English
 Dates: 2004-11-292005-07-182005-09-15
 Publication Status: Published in print
 Pages: 16
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.micromeso.2005.04.022
 Degree: -

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Title: Microporous and Mesoporous Materials
  Abbreviation : Microporous Mesoporous Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 84 (1-3) Sequence Number: - Start / End Page: 302 - 317 Identifier: ISSN: 1387-1811
CoNE: https://pure.mpg.de/cone/journals/resource/954926228401