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

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Weidenthaler,  Claudia
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schmidt,  Wolfgang
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-21BC-6
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.