Patent ID: 7776775

Claim:
A process for preparing a cracking catalyst containing a rare-earth Y-zeolite and a support, said catalyst being characterized in that the rare-earth content of the crystal lattice of the rare-earth Y-zeolite is 4-15 wt % of RE 2 O 3 ; the original unit cell size is 2.440-2.465 nm, the equilibrium unit cell size of the catalyst after 100% steam-aging treatment at 800° C. for 17 hours is larger than 2.435 nm; and the rare earth atom content in the support is 1.0-8.0 wt % of the support, said process comprising the steps of: (1) ultra-stabilizing the Y-zeolite, mixing the ultra-stabilized Y-zeolite directly with deionized water, pulping, and optionally milling to give a molecular sieve slurry; (2) mixing the molecular sieve slurry with a binder slurry and a clay and pulping, or pulping with the binder slurry and the clay in sequence, and forming by spray drying; and (3) washing the formed catalyst, filtering and drying.