The catalytic performance of some metal oxide in the selective oxidation of H2S in the stream containing water vapor and ammonia was investigated in this study. Among the catalysts tested, Co3O4/SiO2 was the most promising catalyst for practical application. It showed very small amount of SO2 emission even in the presence of excess water and ammonia. The solid product formed in the reaction was a mixture of elemental sulfur, ammonium thiosulfate and ammonium sulfate.
Berben PH, Geus JW, "Catalyst for the Selective Oxidation of Sulfur Containing Compounds to Elemental Sulfur," U.S. Patent, 4,818,740, 1989
Brink PJ, Geus JW, "Catalyst for the Selective Oxidation of Sulphur Compounds to Elemental Sulfur, Process for Preparing Such a Catalyst and Method for the Selective Oxidation of Sulfur Compounds to Elemental Sulfur," European Patent, 409,353, 1990
Chopin T, Hebrard JL, Quemere E, "Catalyst for Tail Gas Treatment and Process for Tail Gas Treatment," European Patent, 422,999, 1990