Patent ID: 6908544

Claim:
A cracking catalyst comprising layered clays, wherein said catalyst is prepared by a process consisting essentially of: (1) mixing and slurrying an expandable clay, a modifier, pseudo-boehmite and water for 0.1-10 h to obtain a slurry comprising 10-40% by weight of solid, wherein various substances are added such that the resultant catalyst contains 1-98.8% by weight of the expandable clay, 0.1-50% by weight of the oxide derived from the modifier component, and 0.1-70% by weight of the alumina derived from pseudo-boehmite, based on the total weight of the catalyst, said modifier component is one or more selected from the group consisting of hydroxyl polymers of silicon, aluminum, zirconium, or titanium, and substances comprising one or more of said hydroxyl polymers; (2) heating the slurry obtained in (1) to 50-85° C. and aging the slurry at this temperature for 0.1-10 h; (3) drying and forming the slurry obtained in (2); (4) water washing and aging the formed material obtained in (3) and filtering; and (5) drying and calcining the solid obtained in (4).