METHOD OF RECOVERING ACTIVITY OF A ZEOLITE-CONTAINING CATALYST Russian patent published in 2020 - IPC B01J38/62 B01J38/02 B01J38/50 B01J38/34 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil refining industry, particularly, to recovery of activity of zeolite-containing catalysts of iso-dewaxing of diesel fractions. Invention relates to a method of reducing activity of a deactivated catalyst of a hydroprocessing process, characterized in that the catalyst used is a catalyst for oxidation of diesel fuel, which contains oxides of nickel, molybdenum, copper, boron and / or phosphorus and aluminum, which is subjected to regeneration, including drying catalyst in nitrogen flow at temperature of 200–210 °C for 3 hours, subsequent treatment of catalyst in nitrogen flow at 310–320 °C for at least 8 hours, further treatment of catalyst in nitrogen-air medium with concentration of oxygen 2 % vol. at stepped rise of temperature to 470 °C with holding for not less than 15 hours at each temperature in range of 380–390, 410–420, 465–470 °C, characterized in that after regeneration zeolite-containing catalyst is reactivated by impregnation with aqueous solution of diethylene glycol (DEG), wherein DEG is taken in an amount providing a molar ratio (Ni + Mo) / DEG equal to 1/1, or a mixture of DEG and citric acid (LC) is used, wherein DEG and LC are taken in an amount which provides a molar ratio (Ni + Mo) / (50–70 wt% DEG + 50–30 wt% LC) equal to 1/1, after which the catalyst is held in an impregnating solution, kneaded and dried at temperature of 110 °C for at least 10 hours, followed by treatment of the catalyst at temperature 350 °C for 4 hours in air.

EFFECT: design of a method of recovering activity of a deactivated zeolite-containing catalyst for diesel iso-dewaxing with activity and selectivity at a level corresponding to a similar fresh catalyst.

1 cl, 2 ex