Description of Adsorption Equilibria of Vapors on Zeolites over Wide Ranges of Temperature and Pressure

The distinguishing feature of zeolites as microporous adsorbents is the presence of cations in the micropores. These cations are centers for the adsorption of molecules with a nonuniform electron density distribution. An attempt has been made to develop the theory of volume filling of micropores for approximate description of adsorption equilibria of vapors on zeolites over wide temperature ranges. An adsorption equation has been obtained which takes into consideration, in the general case, both dispersion forces and the forces of interaction of molecules with ions. This equation describes adsorption on the active centers and the filling of the remainder of the adsorption space of the voids after the blocking of the active centers. Several examples of agreement between the results of calculation and experimental data are given.