In this study, a novel vapor phase catalytic process is developed for the removal of H₂S in excess water and ammonia stream. Selective catalytic oxidation of H₂S can produce elemental sulfur and ammonium thiosulfate (ATS) without SOx emission. Phase cooperation for two type mechanical mixtures of V₂O₅+α-SnO^{2 was investigated in selective catalytic oxidation. This study will offer a new solution for removal of H₂S in the stream containing ammonia and water vapor.}