1.Independent of the form of the adsorption isotherm equation, the ratio of the relative adsorption deformation to the adsorption is a linear function of the logarithm of the equilibrium pressure.2.An equation was obtained for the dilatometric curve that contains two parameters, namely the omnidirectional compression coefficient and a constant that is proportional to the standard chemical potential of the adsorbate in a given vacant solution.3.The adsorption isotherm and dilatometric curves were measured for a krypton-granulated zeolite CaA system in the temperature range from 153 to 198°K, and it was shown that the experimental data coincide well with the derived equations.

The osmotic theory of adsorption equilibrium has been extended by deriving and experimentally testing a thermodynamically exact, five-parameter, thermal-adsorption equation. This equation gives a good description of zeolite adsorption of xenon and krypton, being applicable over a wide range of temperatures, pressures, and adsorptions, the latter ranging down to extremely low packing values.

Conditions were found where the experimental adsorption isotherms are simultaneously described by the equations of the theory of the bulk filling of micropores and the osmotic adsorption theory.

We measured the adsorption isotherm and dilatometric curve for zeolite CaNaX during the adsorption of xenon at 180°K.

On the basis of a previously suggested osmotic theory of adsorption of a mixture of gases the authors derive a system of differential equations in partial derivatives. By solving this system we can obtain the equations of the adsorption isotherm for a binary mixture, which satisfy all the imposed conditions.

Dilatometer and adsorption measurements have established that there is a direct proportionality between the change in free energy of the vacancy solution and the relative alteration of the dimensions of the X type calcium and lanthanum ion exchange zeolite under krypton adsorption. Adsorption increases the value of the isotropic coefficient of compression of each of these zeolites by one order of magnitude.

The initial heat of krypton adsorption on zeolite NaX is 15.3 kJ/mole.

The thermal equations of adsorption were derived for the region of temperatures above and below the critical temperature (adsorption of gas and vapor) for the linear isotherms of adsorption, permitting a calculation of the isotherms and isosteres of adsorption according to five parameters (which do not depend on the temperature) in a broad range of variation of the variables, as well as the thermodynamic functions of adsorption equilibrium.

The adsorption of xenon on NaX zeolite was measured in the range of pressures from ∼0.1 Pa to ∼1.4·104 kPa (eight orders of magnitude) and temperatures from 150 to 370‡K, i.e., from a temperature below the melting point of xenon to a temperature 80‡K above the critical point. The results of the measurements were tabulated.

The thermodynamics of adsorption was considered for the case when the equilibrium gas phase is sharply nonideal, and it was shown, in particular, that in this region it is advisable to use not the values of the heats of adsorption, but the values of the partial molar enthalpies as the energy characteristic of the adsorbed substance.

The isosteres for the adsorption of chlorotrifluoromethane by zeolite NaX continue linearly in the temperature region above the critical temperature.

Based on measuring the sorption of the Freon CCIF3 on zeolite NaX in a broad range of temperatures and pressures, the enthalpy and heat capacity of the sorbed substance as functions of the temperature were calculated along the adsorption isosteres.

The isosteres for the adsorption of xenon on zeolite NaX and active carbon SKT were measured in a wide range of the parameters of adsorption equilibrium.

A thermodynamic method of determining the capacity of a monomolecular layer and, consequently, the specific surface for nonporous adsorbents, based on an analysis of the adsorption isotherms of vapors at different temperatures and a calculation of the basic thermodynamic functions, has been proposed.