POTENTIAL-THEORY OF ADSORPTION AND ADSORBATE COMPRESSIBILITY

The potential theory of adsorption has been modified, taking into acco unt the adsorbate compressibility. A new equation has been obtained fo r adsorption isotherms in general cases. A particular case of micropor ous adsorbents such as active carbons is considered in detail. The Dub inin-Radushkevich equation has been corrected. The estimations, with t he example of benzene adsorption on a model typical microporous adsorb ent, show that ignoring the adsorbate compressibility leads to mistake s in the calculation of adsorption isotherms via the conventional Dubi nin-Radushkevich equation of about 10% at room temperature, and this d ifference increases with an increase in the temperature. This paper is a development of the previous paper (Commun. Acad. Sci. USSR (Chem.) 1, 13 (1992)), in which attention was paid mainly to calculating the m icropore volume from the experimental value of the limit of adsorption . (C) 1994 Academic Press, Inc.