Selective removal of H2S from coke oven gas

Abstract

The catalytic performance of some metal oxides in the selective oxidation of H2S in the stream containing water vapor and ammonia was investigated in this study. Among the catalysts tested, V2O5/SiO2 and Fe2O3/SiO2 catalyst showed good conversion of H2S with very low selectivity to undesired SO2. Hydrogen sulfide could be recovered as harmless solid products (elemental sulfur and various ammonium salts), and distribution of solid products was varied with types of catalyst and compositions of reactant. XRD and FT-IR analysis revealed that the salt was mixture of ammonium-sulfur-oxygen compounds, It was noteworthy that V2O5/SiO2 catalyst produced elemental sulfur and ammonium thiosulfate, and that elemental sulfur was principal product on Fe2O3/SiO2 catalyst. Small amount of ammonium sulfate was obtained with the Fe2O3/SiO2 catalyst. In order to elucidate the reaction path, the effects of O-2/H2S ratio and concentration of NH3 and H2O are also studied with the V2O5/SiO2 catalyst. (C) 1998 Elsevier Science B.V. All rights reserved.