Elucidating the Changes in Activated Carbon Pore Structure as a Result of Tert -Butylbenzene Adsorption and its Desorption by Means of Supercritical Carbon Dioxide

Abstract

Inverse gas chromatography was applied to characterize the changes in pore structure of activated carbon samples (commercial, de-ashed, and de-ashed and oxidized) before and after the adsorption of tert-butylbenzene, and after its desorption by means of supercritical carbon dioxide. The slit-like micropore model was used for the description of the pore structure. It was shown that tert-butylbenzene was desorbed with greater difficulty from samples containing basic impurities. Changes in the amounts of surface groups (acidic and basic) during the desorption process were not significant.

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