This study is the third in a series examining the extension of the regenerable S Zorb (TM) SRT (Sulfur Removal Technology) system beyond sulfur removal from gasoline and into its application under warm-gas conditions. Previously, the fourth generation of this sorbent system was found to be effective and regenerable for the removal of up to 1 wt.% sulfur from a working gasifier product stream. In this study, the robustness of the system towards exposure to hydrogen chloride and ammonia was tested. The relationship between these compounds and the formation of zinc silicate and zinc sulfate within the sorbent was of particular interest since the formation of these phases most dramatically impacts the absorptive capacity of sulfur. (C) 2010 Elsevier B.V. All rights reserved.