Selective hydrogenation catalyst used for the treatment of gasoline cuts containing diolefins and styrenic compounds

is disclosed a catalyst for the selective hydrogenation of diolefinic unsaturated compounds and styrenic (particularly styrene) in gasoline, without hydrogenating the aromatic and monoolefinic compounds. This catalyst comprises a support selected from refractory oxides such as aluminas, silicas, silica-aluminas or magnesia, used alone or in mixture between them, having deposited thereon at least one noble Group VIII metal, such as palladium, and at least one group VIB metal, such as molybdenum and / or tungsten.