PRESULFURATION OF CATALYSTS USED FOR PROCESSING HYDROCARBONS

摘要

ABSTRACT OF THE DISCLOSURE A method of two-stage treatment of a new or regenerated catalyst comprising (a) a support based on at least one oxide of a metal or a metalloid and (b) at least one active metal, in which method, in a first stage performed "ex situ" between 0 and 50 ° C and in the absence of hydrogen, the catalyst is treated with at least one sulfurizing agent so as to incorporate this agent partially or totally in the porosity of the catalyst, the sulfurizing agent being a polysulfide of general formula R - S (n) - R 'where n is an integer from 3 to 20 and wherein R' represents a hydrogen atom or another radical identical or different from radical R, these two radicals thus each representing an organic radical containing 1 to 150 carbon atoms per molecule, said sulfurizing agent being used in solution in a solvent. Then the process is characterized by a second step during which, after optionally drying the catalyst, the catalyst is treated by a method characterized in that (a) is treated (first part of the second step) the catalyst, in the absence of hydrogen and in the presence of an inert gas or non-inert gas, for at least about 5 minutes, "in situ" or "ex situ," at a temperature between 65 and 275 ° C, and (b) then processes this catalyst (second part of the second step) for at least 1 minute at a temperature of at least 275 ° C.