Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 210, Issue -, Pages 20-25Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2015.02.013
Keywords
Synthetic aluminosilicate natrolites; Various alkali cation forms; Crystal structures; Framework flexibility
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Funding
- NCRI [2012R1A3A-2048833]
- BK 21-plus programs through the National Research Foundation of Korea
- MSIP
- POSTECH
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The structures of the Na+, K+, Rb+, and Cs+ forms of PST-3 and PST-4, two synthetic aluminosilicate natrolite zeolites with almost completely disordered and ordered distributions of framework Si and Al atoms, respectively, in both hydrated and dehydrated states have been determined using synchrotron powder X-ray diffraction and Rietveld analyses. It was found that the trivalent tetrahedral atom (T-atom) content, as well as the type of extraframework alkali metal cations and the hydration state, is a more important factor governing the framework flexibility of this family of small-pore zeolites than the T-atom distribution. (C) 2015 Elsevier Inc. All rights reserved.
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