SELECTIVE REMOVAL OF H2S FROM COKE-OVEN GAS

The catalytic performance of some metal oxides in the selective oxidat ion of H2S in the stream containing water vapor and ammonia was invest igated 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 soli d products (elemental sulfur and various ammonium salts), and distribu tion of solid products was varied with types of catalyst and compositi ons of reactant. XRD and FT-IR analysis revealed that the salt was mix ture 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. Sm all amount of ammonium sulfate was obtained with the Fe2O3/SiO2 cataly st. In order to elucidate the reaction path, the effects of O-2/H2S ra tio and concentration of NH3 and H2O are also studied with the V2O5/Si O2 catalyst. (C) 1998 Elsevier Science B.V. All rights reserved.