Zeolite Beta can be dealuminated by treatment with either (NH4)2SiF6 in aqueous suspension or SiCl4 vapours in a high temperature reaction; under appropriate conditions, the material essentially retains its crystallinity.
J. Weitkamp, M. Sakuth, C. Chen and S. Ernst, J. Chem. Soc., Chem. Commun., 1989, 1908 DOI: 10.1039/C39890001908
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