CATALYST AND PROCESS FOR DECOMPOSING CARBONYL SULFIDE AND HYDROGEN CYANIDE

摘要

A solution of a chromium compound is impregnated into a silica-alumina carri er made of alumina and containing 1 to 5 weight % of silica relative to the weight of the carrier, thereby to obtain a decomposing catalyst carrying 10 to 15 weight % of chromium oxide relative to the weight of the catalyst in term s of Cr2O3. By contacting mixed gas obtained through partial oxidation of heav y oil and/or coal with the decomposing catalyst, COS and HCN contained in the mixed gas are decomposed/removed. In this case, transition of alumina into boehmite can be suppressed owing to coexistence of silica and chromium oxide , so that COS and HCN can be decomposed by highly active catalytic reactions over a long time.