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Flexibility Of The Zeolite Rho Framework: The Redistribution Of Extra Framework Cations As A Function Of Temperature.

Published online by Cambridge University Press:  15 February 2011

John B. Parise ,
Xing Liu ,
David R. Corbin  and
Glover A. Jones
John B. Parise
Affiliation:
Department of Earth and Space Sciences, State University of New York, Stony Brook NY 11794–2100
Xing Liu
Affiliation:
Department of Earth and Space Sciences, State University of New York, Stony Brook NY 11794–2100
David R. Corbin
Affiliation:
Central Research Development, Du Pont Company, Experimental Station, P. O. Box 80262, Wilmington DE 19880–0262, Contribution Number 5872.
Glover A. Jones
Affiliation:
Central Research Development, Du Pont Company, Experimental Station, P. O. Box 80262, Wilmington DE 19880–0262, Contribution Number 5872.
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Abstract

Upon heating Ba2+, Sr2+ and Cd2+-exchanged zeolite RHO, abrupt changes have been observed in the cubic unit cell parameters [1–3]. Calculations of the powder x-ray diffraction patterns indicate these changes result from relocation of the extra-framework cations. For Ba2+ and Sr2+-exchanged RHO, a shift from the single 8-ring (S8R) to the double 8-ring (D8R)-site is accompanied by contraction of the unit cell. However, for the Cd2+-exchanged material relocation from the S8R to the single 6-ring (S6R)-site coincides with cell expansion. Further, with relocation of Cd2+ the low temperature acentric (A) form is transformed to a centric (C) structure above 300°C. The shift of Cd2+ ion occurs over a distance of 5.7Å, the largest observed in a zeolite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 233: Symposium U – Synthesis/Characterization and Novel Applications of Molecular Sieve Materials , 1991 , 267
Copyright
Copyright © Materials Research Society 1991

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References

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