日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

Heats of adsorption, their thermodynamical definition and their direct measurement, as well as their application for zeolite characterization were briefly reviewed.

Adsorption characteristics of zeolites are characterized by the presence of regular pore structure called nano-space and also of active adsorption sites. The former contributes to the adsorption of pore filling type with van der Waals interaction and the latter to the specific adsorption with higher interaction energy. Analysis of heats of adsorption of a variety of adsorbates can lead to the characterization of zeolite surfaces with regards to their polarity (hydrophilicity-hydrophobicity), acid-base character, surface energy distribution, adsorbed states and so on.