Synthesis And Characterization Of Y/Kaolin Composite With Heteboatom Iron

In our country kaolin resources is very abundant, so the cost of industrial zeolite Y synthesis will reduce with kaolin as raw material. In petroleum cracking industry, fluid catalyst cracking of kaolin has become the main body. With the heavy crude oil and the rising of oil refining, Blending residue has become a trend.The high activity, good seletivity and excellent catalyst for heavy oil conversion capacity of FCC catalyst are the basic requirements of refinery. The activity and selectivity of catalyst can be improved by increasing the content of zeolite Y in the catalyst. During in-situ crystallization process w ith kaolin as raw materials, not only improve the content of molecular sieve, but also stengthen the role between kaolin matrix and zeolite Y, so as maintain the strength of the catalyst. The FCC catalyst synthesised by in-situ crystallization has high activity, large heavy oil conversion capacity, long life and so on.In this paper, we used the in-situ synthesis method by pre-prepared suzhou kaolin and prepared a Y/Kaolin microsphere composite. Through strict control of experimental conditions, we studid the factors of synthesis. On the basis of optimal reaction conditions, FeY heteroatom zeolite/Kaolin comosite was synthsis by hydrothermal with two methods. All of the samples have been characterized by the XRD, XRF, SEM, N2-sorption, FT-IR, UV, TG-DSC techniques.The result show that:the control of synthesis conditions on the formation of zeolite is very important, the calcination temperature, solution alkalinity, aging time, crystallization temperature and crystallization time are all important factors in the formation of zeolite Y. It was found that Y/Kaolin microsphere composite with high crystallinity still be synthesized even without directing agent, which is replaced by the suitable initial material and appropriate aging time. We succeesfully prepared a Y/Kaolin composite with Y's relative crystallinity reached 62.5% and SiO2/Al2O3 ratio of 3.6. With the appropriate source of iron, the iron into the framework of zeolite Y, which with high crystallinity(51.3%) and laige surface(699m2/g Langmuir surface area), Content of iron reached 5.1 wt%.