Process for the selective hydrogenation of hydrocarbons

A process for the selective hydrogenation of diolefins in a charge consisting essentially of monoolefins and, as impurities, diolefins, comprising contacting the charge and hydrogen with a supported catalyst at a temperature between 0.degree. and 200.degree. C. and a pressure between 20 and 300 bars in the absence of carbon monoxide, said catalyst, based on its total weight, containing:

• a) 0.1 to 10% of at least one group VIII metal chosen from within the group consisting of nickel, palladium, platinum, rhodium and ruthenium;
• b) 0.01 to 10% of at least one additional metal of group IIIA chosen from within the group consisting of gallium and indium.