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  Thermal induced transformations on completely Zn2+ exchanged zeolites A and Y

Weidenthaler, C., & Schmidt, W. (2001). Thermal induced transformations on completely Zn2+ exchanged zeolites A and Y. Zeitschrift für Kristallographie-Crystalline Materials, 216(2), 105-111. doi:10.1524/zkri.216.2.105.20331.

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 Creators:
Weidenthaler, Claudia1, Author              
Schmidt, Wolfgang1, Author              
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1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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 Abstract: The thermal stability of completely Zn2+ exchanged zeolites A and Y during calcination is studied from R.T. to 1350°C. The phase formation processes are analysed by in situ X-ray diffraction experiments as well as by quenched samples analysed and quantified by Rietveld refinements. The framework structures of the exchanged zeolites A and Y are observed to collapse above 850°C. At higher temperatures the crystallisation of Zn-β-quartz, mullite, and gahnite is initiated from the amorphous phase. Above 1050°C quartz appears and Zn-β-quartz disappears. The crystallisation of willemite is only observed for ZnA, mullite is not stable above 1150°C in both systems. Further increase in temperature leads to the crystallisation of cristobalite accompanied by the disappearance of quartz. The final crystalline components at 1350°C are, for both zeolite precursors, gahnite and cristobalite. Differences between the zeolite precursors are the amounts of amorphous phase formed, indicating a suppression of the formation of a crystalline SiO2 phase in the ZnY samples.

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Language(s): eng - English
 Dates: 2000-05-152000-08-102009-09-252001-02-01
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1524/zkri.216.2.105.20331
 Degree: -

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Title: Zeitschrift für Kristallographie-Crystalline Materials
  Abbreviation : Z. Kristallogr. - Cryst. Mater.
Source Genre: Journal
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Publ. Info: Berlin/Boston : de Gruyter
Pages: - Volume / Issue: 216 (2) Sequence Number: - Start / End Page: 105 - 111 Identifier: ISSN: 2194-4946
CoNE: https://pure.mpg.de/cone/journals/resource/2194-4946