  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.
