Heats of n-hexane and n-heptane vapor adsorption onto polyhydroxyaluminum montmorillonite

The differential isosteric heat of the adsorption of n -hexane and n -heptane vapors on dehydrated polyhydroxyaluminum montmorillonite was determined. Using the temperature dependence of the parameters of the adsorption equilibrium, it was established that substituting sodium ions for polyhydroxyaluminum cations leads to an increase in the volume of micropores and the adsorption heat of hydrocarbons, and the curves of the adsorption heats of C 6 H 14 and C 7 H 16 are of an extreme nature. The appearance of the maxima is associated with the interaction between and among the adsorbate molecules and active centers, due to consolidation in the process of filling micropore volumes.