Journal
CARBON
Volume 38, Issue 13, Pages 1767-1774Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-6223(00)00011-7
Keywords
activated carbon; surface treatment, gasification; adsorption
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Several types of activated carbon sorbents were evaluated for removal of H2S at high temperatures (400-600 degrees C) in an integrated gasification combined cycle (IGCC) power generation process. Part I of this series of papers discussed the effects of gas composition and metal addition. Here we examine the effects of gas temperature, gas pressure and sorbent regeneration. Adsorption experiments with a zinc-impregnated activated carbon sample produced almost identical breakthrough times at varied temperatures (400-600 degrees C). High pressure (10 atm) adsorption experiments showed significantly longer breakthrough times at 10 atm compared to 1 atm. Gaseous H-2 sample regeneration was found to be the most effective regeneration method of the variety of methods analyzed, with all previously H2S adsorbed sulfur being removed in a H-2 regeneration experiment. While additional research is necessary to further evaluate sample regeneration and multi-cycle adsorption/regeneration, results of temperature and pressure effect experiments are encouraging for IGCC applications. (C) 2000 Elsevier Science Ltd. All rights reserved.
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