Bimetallic or multi-metallic catalyst that has an optimized bimetallicity index and an optimized hydrogen adsorption capacity

A process for preparation of a catalyst that comprises a metal M from the platinum group, at least one promoter X1 from the group of tin, germanium, and lead, a halogenated compound, and a porous substrate, in which the X1/M atomic ratio is between 0.3 and 8, the Hir/M ratio that is measured by hydrogen adsorption is more than 0.40, and the bimetallicity index BMI that is measured by hydrogen/oxygen titration is more than 108, said process comprising the following stages:

• a) Introduction of a fraction of the promoter X1 into the substrate or on the substrate,
• c) Calcination of the product that is obtained in stage a,
• d) Deposition on resultant calcined product of step (c) of at least one metal from the platinum group M,
• e) Optional drying under neutral atmosphere or atmosphere containing oxygen, at a moderate temperature,
• f) Deposition of a complementary fraction of the promoter X1 on the product that is obtained in stage d or e,
• h) Calcination of the product that is obtained in stage f with at least one of the following provisions for providing halogen to the catalyst:
• at least one of promoter X1 and metal of platinum group M is a precursor containing halogen, or there is introduced a halogenated compound or a halogen at one or more stages.