Principles of the theory of adsorption of large molecules in pores with nonuniform walls |
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Authors: | Yu K Tovbin |
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Institution: | (1) State Research Center of the Russian Federation “L. Ya. Karpov Institute of Physical Chemistry”, 10 ul. Vorontsovo pole, 103064 Moscow, Russian Federation |
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Abstract: | Principles of the theory of adsorption of large molecules blocking more than one adsorption center on a surface in slit-like
pores are proposed. The theory takes into account lateral adsorbate—adsorbate interactions and nonuniformity of the pore walls.
The equations of adsorption isotherms are derived using the cluster approach. The lateral interactions are taken into account
in the quasi-chemical approximation, preserving effects of direct correlations, and in the mean field approximation without
effects of correlations. The following problems are discussed: 1) distinguishing of partial contributions of nonuniform adsorption
centers on the pore walls; 2) exact solution for dimer adsorption in a two-layer pore with uniform walls; 3) basic types of
adsorption isotherms, for which the differences are due to various orientations of the adsorbate in micropores with uniform
walls; 4) estimates of the pressure responsible for volume filing of micropores; and 5) the effect of nonuniformity of the
pore walls on the pressure values.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1467–1478, August, 1999. |
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Keywords: | adsorption isotherm slit-like pores nonuniform surface blocking of adsorption centers lattice-gas model cluster approach quasi-chemical approximation model of contacts |
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