Abstract
Abstract Aluminium ion was extracted stoichiometrically from the framework of the faujasite-type zeolite by EDTA treatment. Dealuminated zeolites with various silica/alumina ratios (from 4.80 to 10.29) were obtained. A dealuminated zeolite does not necessarily show the molecular-sieve-type adsorption isotherm of nitrogen. The lattice constant of zeolite decreases with the silica/alumina ratio. The zeolite with an increased silica/alumina ratio has a higher catalytic activity for a cumene-cracking reaction than the parent H-Y4.80 zeolite. It is suggested, on the basis of infrared spectroscopic and calorimetric measurements, that the total number of acid sites decreases with dealumination, while the number of strong acid sites increases. These strong aicd sites seem to contribute to the catalytic activity of dealuminated zeolite.
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