Surface Organometallic Chemistry: Molecular Approaches to Surface Catalysis
Surface organometallic chemistry is a new field bringing together researchers from organometallic, inorganic, and surface chemistry and catalysis. Topics ranging from reaction mechanisms to catalyst preparation are considered from a molecular basis, according to which the "active site" on a catalyst surface has a supra-molecular character. This. the first book on the subject, is the outcome of a NATO Workshop held in Le Rouret. France, in May. 1986. It is our hope that the following chapters and the concluding summary of recommendations for research may help to provide a definition of surface organometallic chemistry. Besides catalysis. the central theme of the Workshop, four main topics are considered: 1) Reactions of organometallics with surfaces of metal oxides, metals. and zeolites; 2) Molecular models of surfaces, metal oxides, and metals; 3) Molecular approaches to the mechanisms of surface reactions; 4) Synthesis and modification of zeolites and related microporous solids. Most surface organometallic chemistry has been carried out on amorphous high-surf ace-area metal oxides such as silica. alumina. magnesia, and titania. The first chapter. contributed by KNOZINGER. gives a short summary of the structure and reactivity of metal oxide surfaces. Most of our understanding of these surfaces is based on acid base and redox chemistry; this chemistry has developed from X-ray and spectroscopic data, and much has been inferred from the structures and reactivities of adsorbed organic probe molecules. There are major opportunities for extending this understanding by use of well-defined (single crystal) oxide surfaces and organometallic probe molecules.
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THE SURFACES OF OXIDES AT A MOLECULAR LEVEL
REACTION OF ORGANOMETALLICS WITH SURFACES OF METAL OXIDES
CATALYTIC REACTIONS CARRIED OUT WITH METALS DERIVED
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acid active addition adsorbed alkene application approach atoms bimetallic bonds carbon Catal catalysts cations centers characterization Chem chemical chemistry clays complexes composition compounds considered containing coordination crystal derived developed direct distribution effect electron evidence example Figure formation formed framework further give groups heterogeneous higher homogeneous hydrocarbons hydrogen hydroxyl important increasing indicated interaction interest intermediates involving ions ITALY known layers ligands materials mechanism metal clusters metal particles methods models molecular molecular sieves molecules nature nuclearity observed obtained occur organic organometallic organometallic chemistry oxidation oxide surfaces oxygen palladium particular Phys pillared pore possible prepared present properties reaction reactivity recent reduced reported selectivity shown silica similar solution species stability steps structure studies supported surface synthesis Table techniques temperature tetrahedral Trans transformations transition units yield zeolite