Structural and physicochemical properties of natural zeolites:clinoptilolite and mordenite

摘要

Natural,H-form and Pd-containing clinoptilolite and mordenite were characterized using adsorption,AFM,FTIR,and TG-DTA methods.The initial natural adsorbents have small specific surface area which increases significantly after their modification.FTIR spectra show the presence of the same typical bands in natural and H-form zeolites.However,the spectra of Pd-including clinoptilolite have a band of ammonia at v = 1449 cm~(-1),which can be associated with its adsorption complexes with palladium.The TG data show the presence of several types of water,and larger amounts of water desorb from H-forms of both zeolites up to 120 deg C that can be caused by stronger changes in the zeolite structure.However,the zeolite skeleton does not change after acidic processing.The changes are more visible for treated clinoptilolite.