Studies On The Technics Of Synthesizing Zeolite Molecular With Coal-beared Kaolin Mineral And The Application Of The Product In Catalytic Cracking Catalyst

Coal-based kaolin mineral source of China has an abundance reserves, a widedistribution, an excellent characteristic and is easy to exploit and develop. Especiallyrecent years, the industrial need of kaolin increases gradually with the development ofindustry and the improvement of technics. At the same time, higher quality and morestandard of kaolin products make the traditional application gone step further. Fluidcatalytic cracking catalyst with kaolin as primary component has developed to mainbody catalyst of oil chemistry industry.Most of the kaolin of Inner Mongolia is coal-based kaolin which is abundance andsteady. How to utilize these unused resource is the emphasis of the research. Firstly,we studied chemical component, crystal structure and calcination character of thekaolin of Inner Mongolia compared with none coal-based kaolin of Suzhou. Results ofXRD, SEM, TEM and Differential Thermal Analysis indicated that the kaolin samplehas full crystal, high purify and good quality. Detailed research of calcined processprovided academic foundation to synthesis of zeolite molecular.Then this paper studies on the technics of synthesizing zeolite molecular withcoal-based kaolin mineral. The effect of chemical composition, crystal structure andcalcinated properties of kaolin of Inner Mongolia to synthesize molecular sieves havebeen studied. It is concluded that the whiteness of the product was increased butcalcium ion exchange capacity of the product was decreased with the calcinatedtemperature increased.NaA zeolite and NaY zeolite with normal size were successfully synthesizedthrough hydrothermal method. NaY zeolite with nanosize was successfullysynthesiezed by adding citrate as complexing agent to synthesis batch. XRD and TEMresults indicated that all of these products had full crystal structure and high purify,and the crystal zeolite product had an average size under 100nm.Fluid catalytic cracking catalysts was prepared respectively from kaolin clays andthese zeolites. FCC Test results found that coal-based kaolin used as matrix showedlower mechanic strength and easier breakage and produced more gas and less gasolinethen Suzhou kaolin. We found that Y zeolites has higher cracking activity than Azeolites. Compared with catalyst containing conventionally hydrothermal synthesizedNaY zeolite, catalyst containing nanosized zeolite exhibited good big moleculecracking performance and excellent selectivity.