CATALYST FOR USE IN HYDROTREATMENT COMPRISING METALS OF GROUP VIII AND VIB AND PREPARATION WITH CITRIC ACID AND C1-C4 DIALKYL SUCCINATE

摘要

The invention relates to a catalyst comprising an alumina-based amorphous support, a C1-C4 dialkyl succinate, citric acid and optionally acetic acid, phosphorus and a hydro-dehydrogenating function comprising at least one element. Group VIII and at least one element of Group VIB, a catalyst whose Raman spectrum comprises the most intense bands characteristic of Keggin heteropolyanions (974 and / or 990 cm), C1-C4 dialkyl succinate and citric acid (including 785 and 956 cm). The invention also relates to the process for preparing said catalyst in which a catalyst precursor in the dried, calcined or regenerated state containing the elements of the hydro-dehydrogenating function, optionally phosphorus, is impregnated with an impregnation solution comprising at least one a C1-C4 dialkyl succinate, citric acid and optionally at least one phosphorus compound and optionally acetic acid, and is then dried. The invention also relates to the use of this catalyst in any hydrotreatment process.