Adsorption of gases, vapors and liquids on zeolites under high pressures

Using the example of Xe adsorption on NaX zeolite, the character of adsorption isostere behaviour in a wide range of temperatures and pressures is discussed. It is shown that isostere linearity and maxima on the curves of isosteric heat capacity of the adsorbate at high concentrations of molecules in cavities evidently testify the presence of secondary phase transitions in the adsorbed substance