NaY/KAOLIN COMPOSITE AS PROMISING FCC CATALYST FOR HEAVY OIL UPGRADING

摘要

Since its attractive activity and selectivity, zeolite Y, later modified zeolite Y has been widely used as the major active component in most commercial fluid catalytic cracking (FCC) catalysts1. At present, the active zeolitic component was incorporated into the microspheres of the FCC catalyst by two general techniques. In one technique, the zeolitic component was firstly crystallized and modified, and then it was mixed with kaolin, binder and at last it was shaped as microspheres catalyst. In the other technique, that was in-situ technique, microspheres were firstly shaped, and the zeolitic component was then crystallized in the microspheres and finally the zeolite containing microspheres were modified to the finished catalyst. It was known that Y zeolite in-situ synthesized by using kaolin microsphere had excellent activity and stability compared with commercial gel zeolite NaY and it have been received great success in the industry2, 3. However, in the past 40 years, the effort of the kaolin transformation to zeolite Y was mainly focused on the in-situ synthesis of zeolite Y by using the pre-shaped kaolin microspheres. As for zeolite Y derived from powdered kaolin, numerous studies were conducted on its synthesis. However no systematic results were published, including properties and its performances as the active component of FCC catalyst.