Abstract
When designing a FCC catalyst for a specific operation, the following factors should be taken into consideration: feedstock type, FCC unit design, process conditions, product demands, environmental factors and cost effectiveness. Each of these factors is discussed and illustrated with examples. The composition of some major categories of FCC catalysts (gasoline, octane and resid catalysts) is presented. Important physical characteristics of these catalysts and factors affecting their design are described. The effect of zeolite structural and physico-chemical properties on catalytic performance, as well as the role and composition of matrices and additives is broadly discussed. The last part of the article summarizes the guiding principles to be used in the formulation of different catalysts designed for specific applications. Present areas of research are being outlined. Possible catalyst and process changes related to gasoline reformulation are being discussed.
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