Abstract
It is known that various surface groups, impurities and surface irregularites (i.e., surface heterogeneity) as well as fine pores of different size and shape (i.e., structural heterogeneity) contribute to the overall energetic heterogeneity of porous solids, which in terms of the condensation approximation can be characterized by the adsorption potential distribution. When the structural heterogeneity dominates, e.g., microporous carbons with a small number of surface groups, the condensation approximation approach leads to a simple relationship between the adsorption potential distribution and the pore volume distribution. This relationship allows a simple calculation of the micropore volume distribution from the adsorption potential distribution. It is shown that the above procedure is essentially equivalent to the so-called Horvath-Kawazoe method of obtaining the micropore volume distribution. Illustrative calculations are presented for low temperature nitrogen adsorption data measured on three different active carbons.
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