Converting sulfur compounds into hydrogen sulfide, comprises contacting gas with gas reductant in p

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The invention relates to a process of conversion into H2S of the sulphur compounds present in a gas including/understanding of H2S and the sulphur compounds. This process includes/understands a stage has of setting in contact of known as gas with a reducing gas in the presence of a catalyst of hydrogenation including/understanding at least cobalt of molybdenum and a support alumina, the sum of the cobalt contents and molybdenum calculated in form oxidizes lying between 3 and 25% weight, the surface of the aforesaid alumina being higher than 140 m2/g. It includes/understands then a stage B of setting in contact of at least a fraction of effluent gas of the stage has with a catalyst including/understanding at least a compound selected in the group consisted titanium oxide and zirconium oxide and at least alkaline-earth, the aforementioned oxides titanium and/or of zirconium corresponding to more than 5% weight of catalyst, the aforementioned catalyst of the stage B) being is in the form of mass oxide not understanding that the aforementioned oxides is in the form of supported oxide, the total mass content of alkaline-earth lying between 0, 5 and 60% weight.