Hydrodesulphurisation. Standard Catalysts for the hydrogenation of organic sulphur compounds in hydrocarbon feedstocks are the cobalt-molybdenum-type catalysts from the HDMax 200 series. These catalysts are used in both liquid and gas phase for all types of hydrocarbons, such as naphtha, LPG, natural gas and off-gases. For the hydrogenation of organic nitrogen compounds and/or olefin saturation the cobalt-molybdenum-based HDMax 310 catalyst is recommended.