Equilibrium Adsorption
in the NitrogenOxygenAnatase System

E. A. Ustinov

St. Petersburg Institute of Technology, Zagorodnyi pr. 49, St. Petersburg L13, Russia

Received May 22, 1996

Abstract—The nitrogen–oxygen–anatase equilibrium system at 78.2 K is considered in the framework of a
model that takes into account (in explicit form) variations of the adsorption potential near the surface of non-
porous adsorbents. It is shown that, in the case of polymolecular adsorption from gas phases of constant com-
position, this model exactly describes the observed phenomenon of constancy of the sorption value for nitrogen
over a wide range of total pressures in the mixture. Based on consideration of obtained dependences of the com-
position of condensed films on the distance from the anatase surface, it is concluded that this surface contains
active sites that are highly selective in sorption of nitrogen by virtue of its quadrupole moment. Agreement
between the theoretical predictions and experimental results indicates that there are no essential distinctions
between the thermodynamic properties of the adsorption phase and the respective bulk liquid phase.

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