Abstract
Silica-rich zeolites were obtained by the reaction of kaolinite and metakaolinite in fluoride-containing medium at elevated temperature. These products have been compared to the corresponding products obtained in alkaline medium. Kaolinite gave zeolite P directly without any intermediate metastable phase, whereas zeolite NaX was the stable intermediate when metakaolinite was used as the starting material. The intermediates and products of the reactions were studied by using XRD, i.r., n.m.r., and SEM techniques. The crystals formed in fluoride medium were found to be quite large in size. However, seeding was essential and the degree of crystallization attained was low in the formation of zeolite NaX. A chabazite-type zeolite phase appeared in both systems after longer reaction times.
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