Properties Of Superfine Zeolite Y With High SiO₂/Al₂O₃Ratio

Fluid catalytic cracking (FCC) process is a core technology of crude oil cracking, which is the important part of components in morden petroleum refineries. The FCC technology innovation, the key lies in the catalyst of development. However, the crude oil quality is becoming more and more serious. It is urgent to develop novel FCC catalysts for catalytic cracking of heavy oil. The superfine zeolite Y with high SiO2/Al2O3ratio can significantly improve the catalytic cracking selectivity for reduced coking, increase diesel yield and the gasoline qulity because to the fact that superfinesized Y have very huge surface areas, and very fastly diffusion characteristics. That is why, How to fastly, directly and efficiently synthesize of superfine zeolite Y with high SiO2/Al2O3ratio, it can be provided powerful support for the development of catalytic cracking technology.Superfine zeolite Y with high SiO2/Al2O3ratio had synthesized using cheap industrial raw materials without the presence of chemical additive via non-template method. On the basis of the preliminary work, using the direct synthesis were prepared Superfine zeolite Y with high SiO2/Al2O3ratio (HSY-M3), Studied the influence of different synthesis conditions. The results show that the Superfine zeolite Y products (HSY-M3-02) with the size at about260nm and the skeleton stability SiO2/Al2O3ratio reach7.1can be synthesized by optimization methods of the synthesis conditions. And then, the structure and physicochemical properties of superfine zeolite Y with high SO2/Al2O3ratio (M3-02) treated by hydrothermal treatment were characterized by SEM, XRD, N2-adsorption,Raman,TGA and Py-IR.The catalytic performance of HSY-M3-02sample was also investigated in a fixed-bed reactor using DIPB as model compound. The results showed that after hydrothermal treatment, the crystallinity of M3-02reached up to81%. The SiO2/Al2O3ratio was14.8with a specific surface area of603.3m2/g. Under the conditions of T=350℃,P=1atm, and WHSV=6h-1,the average cracking rate of DIPB over M3-02was40%and6.2%higher than that over industrial zeolite USY during5hours, So it has good industry application prospects.