Catalytic cracking catalyst

Abstract

The invention provides a catalytic cracking catalyst. The catalytic cracking catalyst contains a modified Y type molecular sieve, alumina containing an additive and clay. In the modified Y type molecular sieve, the content of rare earth oxide is 5 to 12 wt%; the content of sodium oxide is 0.1 to 0.7 wt%; a total pore volume is 0.33 to 0.39 mL / g; the pore volume of secondary pores with a pore diameter of 2 to 100 nm in the modified Y type molecular sieve accounts for 10 to 25% of the total pore volume; a lattice constant is 2.440 nm to 2.455 nm; the content of non-framework aluminum in the modified Y type molecular sieve is no more than 20% of total aluminum content; lattice collapse temperature is no less than 1050 DEG C; and a ratio of the amount of acid B to the amount of acid L is no less than 2.50. The catalyst has higher heavy oil conversion activity, low coke selectivity, and higher gasoline yield, liquefied gas yield, light oil yield and total liquid yield.

Description

technical field [0001] The invention relates to a heavy oil catalytic cracking catalyst and a preparation method thereof. Background technique [0002] At present, the industrial production of high-silicon Y-type zeolite mainly adopts the hydrothermal method. Rare earth-containing high-silicon Y-type zeolite can be prepared by performing multiple rare-earth ion exchanges and multiple high-temperature roasting on NaY zeolite. The disadvantages of zeolite are: because too harsh hydrothermal treatment conditions will destroy the structure of zeolite, Y-type zeolite with high silicon-alumina ratio cannot be obtained; although the production of aluminum outside the framework is very important for improving the stability of zeolite and forming new acid centers Beneficial, but too much aluminum outside the framework reduces the selectivity of zeolite; in addition, many dealuminated holes in zeolite cannot be filled by silicon migrated from the framework in time, often resulting in...

AI Technical Summary

Problems solved by technology

Rare earth-containing high-silicon Y-type zeolite can be prepared by performing multiple rare-earth ion exchanges and multiple high-temperature roasting on NaY zeolite. The disadvantages of zeolite are: because too harsh hydrothermal treatment conditions will destroy the structure of zeolite, Y-type zeolite with high silicon-alumina ratio cannot be obtained; although the production of aluminum outside the framework is very important for improving the stability of zeolite and forming new acid centers Beneficial, but too much aluminum outside the framework reduces the selectivity of zeolite; in addition, many dealuminated holes in zeolite cannot be filled by silicon migrated from the framework in time, often resulting in lattice defects of zeolite, and the crystallization of zeolite remains Therefore, the thermal and hydrothermal stability of the rare earth-containing high-silicon Y-type zeolite prepared by the hydrothermal method is relatively poor, which is manifested in the low lattice collapse temperature, the crystallinity retention rate and the ratio of crystallinity after hydrothermal aging. low surface area retention

However, pore structure analysis showed that gas-phase ultrastable molecular sieves have no secondary pores

[0006] The performance of ultra-stable molecular sieve catalytic cracking catalysts prepared by hydrothermal method or gas phase method in the prior art cannot well meet the current needs of processing heavy oil and inferior oil

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