Patent ID: 7906447
Filing Date: 2011-03-15
Classification: B01J,C10G

Abstract:
1. A process for rejuvenating a supported hydroprocessing catalyst, comprising: a) providing a supported hydrotreating catalyst that is formed by b) stripping the supported hydrotreating catalyst at a temperature less than about 350° C., the supported hydrotreating catalyst including a support, at least one Group VIB metal, and at least one Group VIII metal; c) regenerating the stripped catalyst in the presence of an oxygen containing gas at a temperature of about 500° C. or less; d) impregnating the regenerated catalyst with a solution, slurry, or mixture consisting essentially of at least one Group VIB metal, at least one Group VIII metal, a first organic acid containing a —C(═O)OH functional group and at least one additional functional group selected from carboxylic acid —C(═O)OH, hydroxamic acid —C(═O)N(H)OH, hydroxy —OH, keto >C═O, amino —NH e) partially calcining the impregnated, regenerated catalyst at a temperature from about 300 to about 400° C. to produce a partially calcined, impregnated, regenerated catalyst having a carbon content of at least 5 wt % based on the weight of the partially calcined, impregnated, regenerated catalyst, the at least one organic additive not being present on the partially calcined, impregnated support; and f) sulfiding the partially calcined, impregnated, regenerated catalyst.