INFLUENCE OF THE CONDITIONS OF ACTIVATION ON THE ADSORPTION OF NITROGEN ON CA4NA4A-ZEOLITES

This paper aims to describe the dependence of the adsorption of nitrog en on a CaNaA zeolite on the parameters of thermal treatment. The capa city of adsorption of nitrogen increases with the temperature of pretr eatment up to 850 K and with the air current linear up to 5l/gh. Short times of thermal treatment and a higher concentration of ammonia in t he air current improve the capacity of adsorption. By means of infrare d spectroscopic measurement of the ratio of Si/Al and complexometric a nalysis of Ca and Al it is possible to describe the stoichiometry of t he hydrothermal degradation. Theoretical models for the kinetics of th is reaction and for the degree of hydrothermal degradation depending o n the number of calcium cations in the zeolite are given.