Stratification Curves and Adsorbate Dynamic Characteristics
in Systems with Narrow Pores

Yu. K. Tovbin

Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 103064 Russia

E-mail: tovbin@cc.nifhi.ac.ru

Abstract—A method for calculating phase diagrams of adsorbate stratification is suggested for micro- and
mesoporous adsorbents with complex structures. The method is based on separating out model regions with
porous regular geometries (slitlike, cylindrical, spherical, and globular) in a porous systems. In addition, joints
of pore regions of various types are included and nonuniformity of their walls and structural defects in these
regions are taken into account. Equations for local and integral self-diffusion and shear viscosity coefficients
are discussed. Equations for calculating equilibrium and dynamic characteristics are based on the lattice gas
model in the quasi-chemical approximation for intermolecular interactions. The contributions of near-wall
regions caused by the potential of the molecule–wall system and of central pore regions, capillary condensation
effects, and effects of the surface mobility of molecules are considered.

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