NaY molecular sieve composite mate-rial was in-situ synthesized by kaolin and water glass using hydrothermal method,the fluid catalytic cracking catalyst was prepared by NaY molecular sieve composite material modified through ion ex-change method.The structure of the samples was characterized by X-ray fluorescence,N2 adsorption desorption,scanning electron microscopy,and oth-er instruments.The catalytic cracking reaction per-formance was evaluated on a fixed fluidized bed mi-cro reactor device.The results indicated that the external specific surface area of the NaY molecular sieve composite material was 93.70 m2/g,the meso-porous pore volume was 0.19 cm3/g,and the parti-cle diameter was about 300-500 nm.The mesopores of the modified composite material were mainly dis-tributed in the range of 2-20 nm and exhibited a bimodal pore distribution,with distribution peaks of 3.8 and 5.6 nm respectively.Compared with con-ventional NaY-type molecular sieve catalysts,the conversion rate,liquefied gas and total liquid yield of catalyst prepared by this NaY-type molecular sieve composite material increased by 6.18,5.16,and 1.61 percentage points respectively,while the heavy oil yield decreased by 3.34 percentage points and the coking factor decreased by 0.80.
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