Microporous Adsorbents with Limiting Development of Micropores

Abstract

The adsorption properties for benzene vapors and the pore structure of carbon adsorbents with a practically-limiting macropore volume have been investigated. The salient characteristic of the adsorbents studied was the position of the distribution curves of the micropore volume, whose maxima for the slit-shaped pore model corresponded to halfwidths of 1.2 to 1.4 nm and the micropore volume to 1.5 cm3 g–1. The difference in parameters of the Dubinin-Stoechli adsorption equation was only quantitative. The adsorption isotherms are very closely described by the DS adsorption equation in a broad range of equilibrium relative pressures and temperatures within 293–353 K. The question of the upper limit of micropore size in carbon adsorbents is also discussed.