Hydrodewaxing gas oil - over zeolite of high silica-alumina ratio and contg. transition metal and Gp V111 noble metal

摘要

Gas oil is dewaxed at elevated temps. and under hydrogen pressure by contacting with an aluminosilicate zeolite (I) catalyst having an SiO2/Al2O3 ratio of =12, a constraint index of 1-12, and a crystal density of not substantially below 1.6g/cm3, with the added feature that the catalyst contains at least one multivalent transition metal (II) and at least one Gp. VIII noble metal (III), each is quantities of =2 wt. %. Pref. (I) is ZSM-5, (II) is Zn or Cd and (III) is Pt, Pd or Ir, and specifically (II) is Zn and (III) is Pd. Catalyst cycle life is increased, and unusually high yields are obtd.