| abstract |
A modified Y-type molecular sieve and a preparation method therefor, a hydrocracking catalyst and a preparation method therefor, and a method for hydrocracking hydrocarbon oil. Based on the total weight of the modified Y-type molecular sieve, the modified Y-type molecular sieve contains 0.5-2 wt% of Na2O, the ratio of the total IR acid amount of pyridine of the modified Y-type molecular sieve to the total IR acid amount of N-butyl pyridine of the modified Y-type molecular sieve is 1-1.2, and the total IR acid amount of pyridine of the modified Y-type molecular sieve is 0.1-1.2 mmol/g. The molecular sieve acid center sites of the modified Y-type molecular sieve are distributed mainly in macropores. Applying the molecular sieve to the hydrocracking reaction process of wax oil facilitates improving reaction selectivity of macromolecular cyclic hydrocarbons in the wax oil, reducing occurrence of secondary cracking reaction, improving the quality of hydrocracking unconverted oil, and increasing yield of reactive liquid products. |