Non-framework cation migration and irreversible pressure-induced hydration in a zeolite

Yongjae Lee, Thomas Vogt (), Joseph A. Hriljac, John B. Parise, Jonathan C. Hanson and Sun Jin Kim
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Yongjae Lee: Physics Department, Brookhaven National Laboratory
Thomas Vogt: Physics Department, Brookhaven National Laboratory
Joseph A. Hriljac: University of Birmingham
John B. Parise: State University of New York
Jonathan C. Hanson: Brookhaven National Laboratory
Sun Jin Kim: Korea Institute of Science and Technology

Nature, 2002, vol. 420, issue 6915, 485-489

Abstract: Abstract Zeolites crystallize in a variety of three-dimensional structures in which oxygen atoms are shared between tetrahedra containing silicon and/or aluminium, thus yielding negatively charged tetrahedral frameworks that enclose cavities and pores of molecular dimensions occupied by charge-balancing metal cations and water molecules1. Cation migration in the pores and changes in water content associated with concomitant relaxation of the framework have been observed in numerous variable-temperature studies2,3,4,5, whereas the effects of hydrostatic pressure on the structure and properties of zeolites are less well explored6,7,8. The zeolite sodium aluminosilicate natrolite was recently shown to undergo a volume expansion at pressures above 1.2 GPa as a result of reversible pressure-induced hydration9; in contrast, a synthetic analogue, potassium gallosilicate natrolite, exhibited irreversible pressure-induced hydration with retention of the high-pressure phase at ambient conditions10. Here we report the structure of the high-pressure recovered phase and contrast it with the high-pressure phase of the sodium aluminosilicate natrolite. Our findings show that the irreversible hydration behaviour is associated with a pronounced rearrangement of the non-framework metal ions, thus emphasizing that they can clearly have an important role in mediating the overall properties of zeolites.

Date: 2002
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DOI: 10.1038/nature01265

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