Effect of surface chemistry on the performance of unimpregnated activated carbons as H_2S adsorbents

摘要

Unimpregnated activated carbons were studied as adsorbents of hydrogen sulfide. The samples were characterized using Boehm titration, thermal analysis,a nd sorption of nitrogen. It was found that the choice of unimpregnated carbon for application as H_2S adsorbents should be made based on parameters of its acidity such as number of acidic groups, pH of surface, or weight loss associated with the presence of acids. There are certain threshold values of these quantities which, when exceeded have a dramatic effect on the H_2S breakthrough capacity.