Competitive adsorption of a two-component gas on a deformable adsorbent

Abstract

We investigate the competitive adsorption of a two-component gas on the surface of an adsorbent whose adsorption properties vary in adsorption due to the adsorbent deformation. The essential difference of adsorption isotherms for a deformable adsorbent both from the classical Langmuir adsorption isotherms of a two-component gas and from the adsorption isotherms of a one-component gas taking into account variations in adsorption properties of the adsorbent in adsorption is obtained. We establish bistability and tristability of the system caused by variations in adsorption properties of the adsorbent in competitive adsorption of gas particles on it. Conditions under which adsorption isotherms of a binary gas mixture have two stable asymptotes are derived. It is shown that the specific features of the behavior of the system under study can be described in terms of a potential of the known explicit form.

Structure of the Submonolayer of Ethanol Adsorption on a Vapor/Fused Silica Interface Studied with Sum Frequency Vibrational Spectroscopy

“…This is an indication of competitive adsorption of water and ethanol on fused silica. From the equation for competitive Langmuir adsorption of two species on a surface, 39,50 we can conclude that the adsorption energies of ethanol and water are comparable, but that of ethanol is higher. When the RH is increased up to 64%, which is close to that of the outdoor atmosphere in many places, the CH signal becomes a few times smaller than that in a dry environment.…”