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Recently, catalytic cracking, one of the most industrial important processes, has been the subject of extensive research to obtain valuable petroleum products such as gasoline and propylene from less valuable vacuum gas oil (VGO) or atmospheric residue (AR). Catalysts for catalytic cracking generally consist of both zeolite and matrix. Zeolite is a major catalyst component and both development and modification of zeolites have been very important in the development of catalytic cracking catalysts. USY zeolite is generally applied for industrial processes, but ZSM-51), mordenite2), MCM-223), β2),4), ITQ-75), MCM-686), ZSM-127), etc. have also been evaluated for catalytic cracking. However, zeolites have micropores which are not large enough to transfer bigger molecules such as VGO or AR and to a l low fas t d i ffus ion of subs tances . Therefore, mesoporous matrices have very important functions to diffuse substances more rapidly. Matrix reactivity in catalytic cracking strongly affects not only t he ac t iv i t y bu t a l so t he p roduc t s e l ec t iv i t y. Nevertheless, there are only a few academic studies concerning the matrix. Recently, much attention has been focused on the preparation of meso-/microporous composite materials1),8),9)~13). The formation of hierarchical composite catalysts with both zeolite and mesoporous materials may increase the selectivity for branched products with higher octane number because the large space of the mesoporous material around an active acid site in zeolite promotes the generation of the more bulky branched hydrocarbons. We previously reported that the combination of zeolite with micropores and matrix with mesopores promotes the formation of branched hydrocarbons which largely affects the octane number of gasoline14)~20). Furthermore, hierarchical Y zeolite-containing mesopo34 Journal of the Japan Petroleum Institute, 57, (1), 34-46 (2014)

Catalytic Cracking of VGO by Hierarchical Y Zeolite-containing Mesoporous Silica–Alumina Catalysts Using Curie Point Pyrolyzer