Abstract
The Dubinin-Astakhov (D-A) equation is modified for adosrption of gases on microporous activated carbons with appreciable size distribution of micropores.
Parameters n and E involved in the D-A equation are assumed to vary with the ratio of micropore size to molecular size of adsorbate. Also, E is considered to be in proportion to the standard heat of vaporization of the adsorbate. The dependence of n and E on these characteristics is determined from adsorption data for carbon molecular sieves that have uniform micropores. Thus, once the size distribution function of micropores is given for a commercial activated carbon, adsorption equilibrium of any gas is predictable with the generalized D-A equation proposed here by accounting for the micropore size distribution.
