Method for rejuvenating a catalyst from a hydroprocessing and/or hydrocracking process

A process for the rejuvenation of an at least partially spent catalyst resulting from a hydrotreating and/or hydrocracking process, said at least partially spent catalyst resulting from a fresh catalyst comprising at least one metal from group VIII, at least one metal from group VIb, an oxide support not comprising zeolite, and optionally phosphorus, said process comprises the following stages:

• a) the at least partially spent catalyst is regenerated in an oxygen-containing gas stream at a temperature of between 360° C. and less than 420° C. so as to obtain a regenerated catalyst comprising a carbon content of between 0.1% and 0.5% by weight, a sulfur content of between 0.3% and 0.8% by weight and a proportion of crystalline phase resulting from at least one metal from group VIII and from at least one metal from group VIb determined by X-ray diffraction and characterized by a ratio of the surface area of the diffraction peak of the crystal at 26.6° 2θ to the surface area of the peak characteristic of alumina at 45.7° 2θ of less than 0.6,
• b) then said regenerated catalyst is brought into contact with an aqueous solution consisting of water, of phosphoric acid and of an organic acid having each acidity constant pKa greater than 1.5,
• c) a drying stage is carried out at a temperature of less than 200° C., without subsequently calcining it, so as to obtain a rejuvenated catalyst.