Patent ID: 8148288

Claim:
A catalyst that comprises a metal M from the platinum group, at least one promoter X 1 from the group of tin, germanium, and lead, a halogenated compound, and a porous substrate, in which the X 1 /M atomic ratio is between 0.3 and 8, the H ir /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, produced by a process comprising the following sequential steps: a) Introduction of a fraction of the promoter X 1 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 X 1 on the product that is obtained in stage d or e, and 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 X 1 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.