Abstract
The behaviour of zeolite 4 A in molten alkali halides, sulphates and nitrates has been investigated. The results achieved show that new zeolite forms are obtained by ion exchange and occlusion. It has also been found out that anion dimensions and temperature affect the extent of occlusion. The heating of LiALiNO 3 and NaANaNO 3 zeolites at the temperatures above 600°C resulted in new zeolite forms with increased cation exchange capacity, capable only of ion exchange in the melt. Finally, it has been proved that the ion exchange reaction is impossible without a transfer medium in zeolite cavities, which is provided by occluded salt molecules in the melt, and water molecules in aqueous medium.
Published Version
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