Abstract
A method has been proposed for the determination of the intracrystalline diffusion coefficients for polar substances in zeolites from the exothermic calorimetric curves. If the differential heat of adsorption falls as the degree of filling increases, diffusion is an exothermic process and, therefore, the release of heat in a system with a steep adsorption isotherm (in the case of a measured addition) continues even though the adsorption process may have finished. The exothermic calorimetric curve for NH3 adsorption by the zeolite NU has been taken as an illustration.
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