New catalyst comprising palladium, alkaline and alkaline-earth metal, and porous support comprisin

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The invention relates to a catalyst including/understanding a porous support, palladium, at least a metal selected in the group consisted the alkaline ones and the alkaline-earth ones, in which : surface it specific porous support lies between 50 and 210 m/g, it palladium content in catalyst lies between 0, 05 and 2% weight, - to the less 80% weight of Palladium is distributed in a crust with the periphery of the support, the thickness of the aforesaid the crust lying between 20 and 200 µm, it metal dispersion D lies between 25% and 70%, it density of palladium particles in the crust lie between 1500 and 4100 palladium particles by µm-et the aforementioned alkaline and/or alkaline-earth metal is distributed in a homogeneous way through the support. The invention relates to also the preparation of catalyst and its use in selective hydrogenation.