Changes in the sorption and energy characteristics of montmorillonite upon the substitution of polyhydroxyaluminum cations for exchange sodium ions are studied. Based on the temperature dependence of the equilibrium parameters of adsorption, it was found that the substitution of polyhydroxyaluminum cations for exchange ions results in an increase of micropore volume and the heat of adsorption. The curves of heats of adsorption for C6H14 and CCl4 have extreme characters. The observed maxima are related to the interactions of adsorbate molecules with and between active sites due to their compaction during the filling of micropore volume.
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