Abstract: A method for treatment of a gas having 10 to 0.5% by volume of at least one of COS and CS2, and 30 ppm to 5% by volume of unsaturated hydrocarbons: a) hydrogenation of organic compounds unsaturated with respect to paraffins by contacting the gas with a hydrogenation catalyst in the presence of hydrogen at 100 to 400° C., to provide an effluent that is low in unsaturated hydrocarbon compounds, the hydrogenation catalyst having at least one metal that is palladium, platinum, nickel, or cobalt deposited on a porous substrate. b) catalytic hydrolysis-hydrogenation in the presence of water of COS and/or CS2 present in the effluent of a) to provide an H2S-rich effluent by bringing the effluent from a) into contact with a hydrolysis-hydrogenation catalyst.

Abstract: A method for treatment of a gas having 10 to 0.5% by volume of at least one of COS and CS2, and 30 ppm to 5% by volume of unsaturated hydrocarbons: a) hydrogenation of organic compounds unsaturated with respect to paraffins by contacting the gas with a hydrogenation catalyst in the presence of hydrogen at 100 to 400° C., to provide an effluent that is low in unsaturated hydrocarbon compounds, the hydrogenation catalyst having at least one metal that is palladium, platinum, nickel, or cobalt deposited on a porous substrate. b) catalytic hydrolysis-hydrogenation in the presence of water of COS and/or CS2 present in the effluent of a) to provide an H2S-rich effluent by bringing the effluent from a) into contact with a hydrolysis-hydrogenation catalyst.

Abstract: The present invention relates to a process for treating a gas containing from 10 ppm by volume to 0.5 volume % of at least one of the compounds COS and CS2 and from 30 ppm by volume to 5 volume % of unsaturated hydrocarbon compounds, the said process comprising the following stages: (a) a hydrogenation of the unsaturated organic compounds to paraffins is carried out by contacting the said gas with a hydrogenation catalyst in the presence of hydrogen, (b) a catalytic hydrolysis of COS and/or CS2 present in the gaseous effluent from stage a) is carried out in the presence of water and a hydrolysis catalyst.

Abstract: For conversion of sulphur-containing compounds present in a gas comprising H2S and sulphur-containing compounds into additional H2S, a step A of contacting the gas with a reducing gas and a hydrogenation catalyst comprising cobalt, molybdenum and an alumina support, the sum of cobalt and molybdenum, in the oxide form, being 3% to 25% by weight, the surface area of alumina being more than 140 m2/g. In step B, effluent gas from step A is contacted with a catalyst comprising at least one alkaline-earth element, at least one dopant being iron, cobalt or molybdenum and at least one compound of titanium oxide and/or zirconium oxide, the catalyst for step B) being either in bulk or supported.

Abstract: For the conversion of sulphur-containing compounds present in a gas comprising H2S and sulphur-containing compounds into additional H2S, a step A for bringing said gas into contact with a reducing gas in the presence of a hydrogenation catalyst comprising at least cobalt, molybdenum and an alumina support, the sum of the quantities of cobalt and molybdenum, calculated in the oxide form, being in the range of 3% to 25% by weight, the surface area of said alumina being more than 140 m2/g. In step B at least a fraction of effluent gas from step A is contacted with a catalyst comprising at least one alkaline-earth element, at least one dopant being iron, cobalt or molybdenum and at least one compound of the group constituted by titanium oxide and zirconium oxide, said catalyst for step B) being either in the form of a bulk oxide comprising only said oxides or in the form of a supported oxide.