PROCESSING OF TAIL GASES OF A CLOSED UNIT ON AN OPTIMISED LINE OF CATALYSTS

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The invention relates to a method for converting the sulphur compounds present in a gas, which contains H2S and sulphur compounds, into H2S. The method comprises the step A of contacting said gas with a reducing gas in the presence of a hydrogenation catalyst containing at least cobalt, molybdenum and an alumina substrate, the sum of the calculated contents of cobalt and molybdenum in their oxide form ranging from 3 to 25 wt %, the surface of said alumina being higher than 140 m2/g. The method further comprises the step B of contacting at least one fraction of the effluent gas from step A with a catalyst containing at least one alkaline-earth element, at least one dopant selected from the group containing iron, cobalt and molybdenum and at least one compound selected from the group including titanium oxide and zirconium oxide, wherein the catalyst of step B is either in a mass oxide form containing only said oxides, or in a supported oxide form.