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Abstract

A catalytic cracking catalyst contains 15-50 wt. % of beta zeolite, 10-75 wt. % of clay, and 10-50 wt. % of large-particle-size sol. Its total pore volume is not less than 0.200 mL/g of which more than 60% is attributed to 4-50 nm mesopores. The large-particle-size sol has 10-40 wt. % of Al₂O₃, 50-85 wt. % of P₂O₅, and 0.2-10 wt. % of SiO₂, and an average particle size of 20 to 50 nm. To prepare the catalyst, an aluminum source and deionized water are mixed to obtain a first slurry; the first slurry and a phosphorus source are mixed to obtain a second slurry; a silica sol is added into the second slurry to obtain a third slurry; the third slurry is subjected to aging treatment to obtain a large-particle-size sol, and the large-particle-size sol is mixed uniformly with clay and beta zeolite to obtain a fourth slurry, which is spray dried and calcined.

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