Study of hydrated Na-faujasite zeolites by thermally stimulated currents technique

Abstract

Abstract. The dielectric relaxation of the two faujasite zeolites NaX and NaY as a function of their hydration state, has been studied. The technique of thermally stimulated current (TSC) has been used. Two distinct processes of cationic relaxation have been identified. They correspond to local hops of cations of sites III' and II of the supercage. Analysis of the observed TSC peaks has been performed by the thermal windowing method (TSC/RMA). The activation energies of the two relaxations have been determined as a function of the adsorbed water molecules. The influence of the water molecules on the movement of the cations in the considered sites was explained.