MODIFIED Y-TYPE MOLECULAR SIEVE, PREPARATION METHOD THEREFOR, AND CATALYST CONTAINING SAME

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Disclosed are a modified Y-type molecular sieve containing rare earth and rich in secondary pores, a preparation method therefor, and a catalyst containing the modified Y-type molecular sieve. In the modified Y-type molecular sieve, the content of oxidized rare earth is about 4% to 12% by weight, the content of phosphorus is 0 to 10% by weight, the content of sodium oxide is not more than about 1.0% by weight, the total pore volume is about 0.36 mL/g to 0.48 mL/g, the pore volume of the secondary pores occupies for about 20% to 40% of the total pore volume, the cell constant is about 2.440 nm to 2.455 nm, the content of the non-skeleton aluminum is not higher than about 10%, the lattice collapse temperature is not lower than about 1060ºC, and a ratio of B acid to L acid is not less than about 3.50. The preparation method for the molecular sieve comprises the steps of : rare earth exchange, hydrothermal roasting, gas-phase ultrastable modification and acid treatment, and comprises an optional step of introduction of phosphorus. When the modified Y-type molecular sieve is used in heavy oil catalytic cracking, the modified Y-type molecular sieve has a higher heavy oil conversion activity and a lower coke selectivity, and has a higher gasoline yield, a higher liquefied gas yield, a higher light oil yield and a higher total liquid yield.