Abstract
Various approaches towards the rational design of novel catalysts based on the concept of confinement (site-isolation) of redox active metal centres in molecular sieves are reviewed. These comprise (a) substitution of T elements (Si, Al and P) in the framework of silicates, zeolites, AlPOs and SAPOs, (b) encapsulation of metal complexes in intrazeolite space (ship-in-a-bottle catalysts) and (c) grafting or tethering of metal complexes to the internal surface of the molecular sieves. Related materials - redox pillared clays, clay intercalated metal complexes, redox aerogels and metal complexes incorporated in aerogels - are also reviewed. The advantages and limitations of the various materials with regard to activity and selectivity as catalysts for liquid phase oxidations with O 2, H 2O 2 and RO 2H and stability towards leaching, are discussed.
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