MODIFIED Y-TYPE MOLECULAR SIEVE AND PREPARATION METHOD THEREFOR, HYDROCRACKING CATALYST AND PREPARATION METHOD THEREFOR, AND METHOD FOR HYDROCRACKING HYDROCARBON OIL

摘要

The present disclosure relates to the technical field of hydrocracking, and discloses a modified Y-type molecular sieve and process for preparing same, a hydrocracking catalyst and preparation method thereof, and a method for hydrocracking a hydrocarbon oil. The modified Y-type molecular sieve contains 0.5-2 wt.% of Na₂O based on the total amount of the modified Y-type molecular sieve; the ratio between the total acid amount measured by pyridine and infrared spectrometry of the modified Y-type molecular sieve and total acid amount measured by n-butyl pyridine and infrared spectrometry of the modified Y-type molecular sieve is 1-1.2; the total acid amount measured by pyridine and infrared spectrometry of the modified Y-type molecular sieve is 0.1-1.2 mmol/g. The acid center sites of the molecular sieve of the modified Y-type molecular sieve are intensively distributed in the large pore channels, the molecular sieve is used in the hydrocracking reaction process of a wax oil, which is beneficial to enhancing reaction selectivity of the macromolecular cyclic hydrocarbons in the wax oil, reducing the occurrence of secondary cracking reaction, improving quality of hydrocracking tail oil, and increasing yield of the reaction liquid products.