Hydrogen sulfide in the stream containing ammonia and water vapor was converted into harmless solid products(elemental sulfur and ammonium thiosulfate) without considerable SO₂ emission by the catalytic oxidation. Selectivity to ammonium thiosulfate depends upon the type of catalysts and the composition of reactants. Among the catalysts tested, V₂O₅/SiO₂ catalyst showed the most highest selectivity. This offers a new solution for the treatment of H₂S emission problem from various stationary sources.