Catalyst based on a noble group VIII metal containing silicon and possibly boron, and its use in hydrotreating hydrocarbon-containing feeds

In a catalytic process for hydrogenating an aromatic hydrocarbon-containing feed with hydrogen under hydrogenating conditions, the improvement comprising contacting the feed with a catalyst comprising platinum, said platinum being deposited on a support, said catalyst comprising silicon as a doping element wherein the catalyst is prepared by a process in which a catalytic mass or precursor based on a support comprising platinum is impregnated with at least one solution based on silicon resulting in a higher hydrogenating activity of aromatic compounds in the presence of a small quantity of sulphur in a gas oil, compared to the same catalyst prepared by incorporating the silicon beforehand in the support and adding platinum.