ABSORPTION CALORIMETRIC STUDY OF THE STATES OF WATER AND HYDROCARBONSIN ZSM-5 ZEOLITE MICROPORES

A calorimetric study has been conducted on the interaction of molecule s of water, benzene, and hexane with two samples of an H-form ZSM-5 hy drophobic zeolite. An estimate has been made of the number of H+-cente rs (isomorphous Al3+ cations in the structure) and vicinal OH-groups i n the zeolite micropores. A conclusion has been drawn about the partia l filling of the sinusoidal channels of the ZSM-5 zeolite by adsorbed benzene molecules. It has been shown that the state of the molecules o f these substances in the micropores can be described by a localized a dsorption model. The contribution of rotational and vibrational degree s to the entropy of adsorbed benzene and hexane has been determined.