Study of hydrogen sulfide adsorption on activated carbons using inverse gas chromatography at infinite dilution

Adsorption of hydrogen sulfide on fifteen samples of activated carbons (unm odified and catalytic with introduced basic nitrogen groups) was studied us ing inverse gas chromatography (IGC) at infinite dilution. Porous structure of carbons was evaluated using sorption of nitrogen. From the retention vo lume measured in IGC experiments, heats of adsorption, free energy of adsor ption, entropy, and Henry's constants were calculated. The results showed t he dependence of these quantities on pore sizes of the adsorbents. The stro ng dependence of the isosteric heat of adsorption on the temperature of mea surement and, following this, unusually high heat capacity suggest the stro ng effect of specific interactions and catalytic influence of carbon surfac e even unmodified. The calculated Henry's constants are in agreement with t he Literature data. The adsorption on carbons with incorporated basic nitro gen groups is characterized by stronger adsorbent-adsorbate interactions th an on unmodified carbons.