Catalyst comprising at least one zeolite and a Group VIII and Group VIB metal for use in hydroconversion and its preparation

摘要

The present invention provides a means for improving the selectivity of the zeolite catalyst to middle distillate while retaining or improving the catalytic activity. The present invention relates to a catalyst comprising a support comprising at least one binder and at least one zeolite having at least a series of channels whose openings are defined by a ring containing 12 oxygen atoms, said catalyst Comprising a hydrodehydrogenation function comprising phosphorus, at least one C1-C4 dialkyl succinate, acetic acid, at least one Group VIB element and at least one Group VIII element, The Raman spectrum of ## STR3 ## includes a band characteristic of at least one Keggin heteropolyanion at 990 and / or 974 cm-1, a characteristic band of the succinate ester, and a characteristic main band of acetic acid at 896 cm-1. The invention also relates to a process for the preparation of the catalyst and its use in hydroconversion.