Method for regenerating a catalyst which is spent and regenerated by a hydrodesulfurization process of gasolines

A process for the rejuvenation of an at least partially spent catalyst resulting from a process for the hydrodesulfurization of a sulfur-containing olefinic gasoline cut, said at least partially spent catalyst resulting from a fresh catalyst comprising cobalt and molybdenum, alumina, and optionally phosphorus, said process comprising the following stages:

• a) the at least partially spent catalyst is regenerated in an oxygen-containing gas stream at a temperature of between 350° C. and 550° C. so as to obtain a regenerated catalyst,
• b) the regenerated catalyst is brought into contact with an impregnation solution that consists of Mo and Co as impregnation metals and water,
• wherein the impregnation solution does not contain phosphorus or an organic additive,
• wherein the Mo in the impregnation solution is present as a molybdenum oxide, molybdenum hydroxide, ammonium molybdate, ammonium heptmolybdate, or a silicomolybdic acid,
• wherein the Co in the impregnation solution is present as a cobalt oxide, cobalt hydroxide, cobalt hydroxycarbonate, cobalt carbonate or a cobalt nitrate,
• wherein the molar ratio of the Mo added per Mo already present in the regenerated catalyst being between 0.15 and 2.5 mol/mol, and
• wherein the molar ratio of the Co added per Co already present in the regenerated catalyst being between 0.15 and 2.5 mol/mol,
• c) a drying stage is carried out at a temperature of less than 200° C. so as to obtain a rejuvenated catalyst,
• in which the fresh catalyst has a content of Mo of between 1% and 20% by weight of oxide of said Mo, with respect to the total weight of the catalyst and a content of Co of between 0.1% and 10% by weight of oxide of said Co, with respect to the total weight of the catalyst.