Abstract: In response to the poor correlation between the quality control indicators of raw materials for fluid catalytic cracking(FCC) catalyst production and the physical and chemical properties of products, the quality control indicators of raw materials such as aluminum sol, pseudo boehmite, kaolin, and REY zeolite were optimized, and the performance of the catalyst before and after the optimization of raw material quality indicators was evaluated using advanced cracking evaluation equipment and pilot riser unit.The results showed that the particle size of aluminum sol and the viscosity of pseudo boehmite were well correlated with the wear index and pore structure properties of FCC catalyst. It is feasible to use them as quality indicators for aluminum sol and pseudo boehmite raw materials, and can more intuitively and accurately characterize the quality control effect of raw materials. There is a good correlation between the particle size of kaolin and the wear index of FCC catalysts. The smaller the particle size of kaolin, the better the wear resistance of FCC catalysts; when the rare earth loading (w) of REY zeolite is around 10%, it helps to improve the stability and cracking activity of the catalyst, avoiding the problems of high exchange and low efficiency.The performance comparison of the catalyst before and after index optimization shows that the introduction of indicators such as aluminum sol gel particle size, pseudo boehmite viscosity, kaolin particle size, and REY rare earth loading significantly improves the physical and chemical properties of the FCC catalyst produced, and significantly enhances its heavy oil cracking ability.

Key words: FCC catalyst, raw material quality indicators, alumina sol, pseudo-boehmite, kaolin, Y zeolite