Organometallic clusters heterogeneous catalysts

Recent studies on supported metal clusters show that they may offer a new generation of heterogeneous catalysts (72-76). Surface-bound metal-bimetal clusters, however, especially under reaction conditions, are difficult to characterize (7i, 14, 17), but some information has been accumulated that provides valuable understanding of surface-bound clusters which, on activation, may be converted to active catalysts. These may exhibit distinctive activities and selectivities that differ from those offered by conventionally prepared metal catalysts (12-14, 18). The remainder of this article is devoted to the organometallic surface chemistry of the interaction between metal clusters... 

Ugo R, Dossi C, Psaro R (1996) Molecular metal carbonyl clusters and volatile organometallic compounds for tailored mono and bimetallic heterogeneous catalysts. 1 Mol Catal A 107 13... 

Organometallic oxide clusters containing cubic or incomplete cubic frameworks are very useful for homogeneous or heterogeneous catalysts in the oxidation and metathesis of unsaturated hydrocarbons. Theoretical studies modeling catalytic hydrocarbon transformations on integrated cubic metal oxide clusters show that coordinatively unsaturated metal sites and valley sites play an important role in the activation. We recently reported a novel organometallic oxide cluster with multiple valley sites, [n-... 

Through the years 1970-1990, most applications of organometallic clusters concerned catalysis, either as homogeneous catalysts or as precursors for heterogeneous catalysts. Since these two applications have been extensively reviewed and since homogeneous catalysis is treated elsewhere, the stricter definition of a metal cluster was used a... 

Coordination chemistry and organometallic chemistry enable molecular control of catalytic complexes by manipulation and choice of ligands. Such complexes can also be used as precursors to the catalytically active components of heterogeneous catalysts, resulting in homogeneous distribution of well-defined catalytic clusters. These developments create the promise of a molecular catalytic engineering approach. 

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