CATALYSEUR PREPARE PAR IMPREGNATION D'UNE SOLUTION AQUEUSE CONTENANT DES PARTICULES OXY(HYDROXY)DE D'UN CATION EN INTERACTION AVEC UNE ESPECE MOLECULAIRE D'UN METAL DU GROUPE VIII

Preparation of catalyst precursors (I) comprises preparing a colloidal solution (A), having oxide/hydroxide particles of a cation (D), by dissolving precursor salts of the cation at 5-100[deg] C, where the concentration of (D) is 0.01-1 mol/l in a volume of sodium hydroxide solution (X) or in a volume of water or in a volume of water added with (X); or using a commercial solution of the aqueous colloidal solution (A) and pouring an aqueous solution (B1) containing a group VIII metal precursor salt (Z) i.e. soluble under the used pH conditions, having a concentration of 0.001-1 mol/l. Preparation of catalyst precursors (I) comprises preparing a colloidal solution (A), of defined pH, having oxide/hydroxide particles of a cation M(z+) (D) including the cations of columns IIA, IIIA, IIIB, IVB or IVA of the periodic table, by dissolving precursor salts of the cation i.e. soluble in aqueous solution, at 5-100[deg] C, where the concentration of (D) is 0.01-1 mol/l in a volume of sodium hydroxide solution (X) having a concentration of 0.01-1 mol/l or in a volume of water or in a volume of water added with (X), or using a commercial solution of the aqueous colloidal solution (A) and pouring an aqueous solution (B1) containing a precursor salt (Z) of a metal of having a concentration of 0.001-1 mol/l, where (Z) is soluble under the used pH conditions. Independent claims are included for: (1) the catalyst precursor obtained by the process; (2) preparation of a catalyst from (I) comprising impregnation of the solution obtained at the end of pouring (B1) on a support having a BET (Brunauer, Emmett and Teller) surface of 300 m 2>/g and drying at = 120[deg] C then calcining at 100-600[deg] C; (3) the catalyst obtained by the process; and (4) selective hydrogenation of an olefin cut comprising the implementation of the obtained catalyst.