Hysteresis phenomena in the study of adsorption deformation of adsorbents
A.V. Tvardovskiy
Tver State Technical University
DOI: 10.26456/pcascnn/2025.17.300
Original article
Abstract: As is known, adsorption hysteresis is a phenomenon that occurs in physical adsorption processes. In this case, the amount of adsorbed substance differs when adding gas (or vapor) and when removing it, i.e. the adsorption branch does not coincide with the desorption branch during experimental measurement of the adsorption isotherm. The literature provides various reasons for this phenomenon: surface and volume phase transitions in the adsorbate; capillary effects in pores of a certain geometry; elastic and plastic deformation of the adsorbent; the presence of a potential energy barrier for the penetration of the adsorbate into the pores, etc. It is clear that in the case of capillary condensation in the pores of the adsorbent, irreversibility of adsorption is indeed characteristic, i.e. the adsorption and desorption curves do not coincide, and these curves form an adsorption hysteresis loop. It is assumed that in other cases the key role in this effect is played by the adsorption deformation of the adsorbent. The use of a modern highly sensitive dilatometer for recording the curves of adsorption and desorption deformation of the adsorbent, along with the traditional measurement of adsorption isotherms, allows us to study this problem in detail. The results of such a comprehensive approach are presented in this paper. Organo-substituted Pyzhevsky montmorillonite and organo-substituted synthetic fluorohectorite were used as adsorbents. Their interaction with hexane and benzene vapors was studied. A detailed analysis of the obtained data is carried out, allowing us to state that the adsorption deformation of the adsorbent plays a key role in the adsorption hysteresis.
Keywords: adsorption, adsorbent, adsorption isotherm, adsorption hysteresis, adsorption deformation of the adsorbent, dilatometric method
- Andrey V. Tvardovskiy – Dr. Sc., Professor, Acting Rector, Tver State Technical University
For citation:
Tvardovskiy A.V. Gisterezisnye yavleniya pri izuchenii adsorbtsionnoj deformatsii adsorbentov [Hysteresis phenomena in the study of adsorption deformation of adsorbents], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2025, issue 17, pp. 300-307. DOI: 10.26456/pcascnn/2025.17.300. ⎘
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