Abstract
The crystal structure of a high silica zeolite ZSM-39, unit cell composition excluding residual water and occluded materials—(Na, tetramethylammonium ion, tetraethylammonium ion)0.4 (AlO2)0.4 (SiO2)135.6, was determined by X-ray powder diffraction. The framework is pseudoface-centred, pseudocubic with a = 19.36±0.02 Å and ideal symmetry Fd3m. The framework consists of a space-filling arrangement of pentagonal dodecahedra and hexakaidecahedra and is isostructural with the 17 Å cubic gas hydrate. The ZSM-39 framework is composed entirely of five- and six-rings which limits its sorptive and exchange properties. However, the large fraction of five-rings and the high Si/Al ratio (>40) impart a high thermal stability. ZSM-39 containing no aluminium constitutes the end member composition. Although ZSM-39 is the only synthetic zeolite analogue of a gas hydrate, we propose here two related hypothetical frameworks containing pentagonal dodecahedral cages.
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Schlenker, J., Dwyer, F., Jenkins, E. et al. Crystal structure of a synthetic high silica zeolite—ZSM-39. Nature 294, 340–342 (1981). https://doi.org/10.1038/294340a0
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DOI: https://doi.org/10.1038/294340a0
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