Abstract
Abstract Almost from its beginning, zeolite catalysis has had a strong dependency upon the catalyst structure. Shape selective catalysis using zeolites has controlled selectivity by constraining the reactants that can be admitted to the catalytic sites, the products that can emit from the zeolite pores and the products that can be formed within the zeolite cavity. Although advances continue to be made in this area, they are mainly subtle refinements of the original concepts. A major challenge is and has been to combine the shape selective constraints with homogeneous and/or enzymatic catalysis. The major obstacle has been the limited size of zeolite pores and cavities to accommodate the host homogeneous or enzymatic agents. With the recent discovery of the 18 membered AlPO 4 , VPl-5/MCM-9, hope for the synthesis of zeolites to accommodate such systems has been renewed.
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