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Special Features of the Adsorption Equilibria of the System Benzene/Zeolite CaX

We found that the adsorption equilibria of the system benzene/zeolite CaX show some special features in the shapes of the adsorption isosteric lines (isosteric breaks) and in the dependence of the enthalpy and entropy of adsorption and the maximal values of the heat capacity Ac^** on the amount adsorbed. This is caused by a preferred interaction of the benzene molecules with the Ca + ions, which leads to an energetically preferred configuration. The comparison of these results with those for benzene on zeolite NaX contributes to a better understanding of some problems in these systems. It can be clearly shown that the cations are essentially responsible for the existence and the position of the different thermodynamic states of the adsorbates.