CPC B01J 23/94 (2013.01) [B01J 23/882 (2013.01); B01J 27/16 (2013.01); B01J 35/613 (2024.01); B01J 35/615 (2024.01); B01J 38/02 (2013.01); B01J 38/12 (2013.01); B01J 38/52 (2013.01); C10G 45/04 (2013.01); C10G 2300/207 (2013.01); C10G 2300/4081 (2013.01); C10G 2300/706 (2013.01)] | 14 Claims |
1. 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.
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