Surface Organometallic Chemistry: Molecular Approaches to by Jean-Marie Basset

By Jean-Marie Basset

Floor organometallic chemistry is a brand new box bringing jointly researchers from organometallic, inorganic, and floor chemistry and catalysis. subject matters starting from response mechanisms to catalyst instruction are thought of from a molecular foundation, in response to which the "active website" on a catalyst floor has a supra-molecular personality. This. the 1st publication at the topic, is the end result of a NATO Workshop held in Le Rouret. France, in might. 1986. it truly is our desire that the subsequent chapters and the concluding precis of techniques for learn can assist to supply a definition of floor organometallic chemistry. in addition to catalysis. the relevant subject matter of the Workshop, 4 major issues are thought of: 1) Reactions of organometallics with surfaces of steel oxides, metals. and zeolites; 2) Molecular types of surfaces, steel oxides, and metals; three) Molecular methods to the mechanisms of floor reactions; four) Synthesis and amendment of zeolites and comparable microporous solids. so much floor organometallic chemistry has been performed on amorphous high-surf ace-area steel oxides corresponding to silica. alumina. magnesia, and titania. the 1st bankruptcy. contributed by means of KNOZINGER. offers a brief precis of the constitution and reactivity of steel oxide surfaces. so much of our figuring out of those surfaces is predicated on acid­ base and redox chemistry; this chemistry has constructed from X-ray and spectroscopic info, and lots more and plenty has been inferred from the buildings and reactivities of adsorbed natural probe molecules. There are significant possibilities for extending this figuring out by means of use of well-defined (single crystal) oxide surfaces and organometallic probe molecules.

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Extra resources for Surface Organometallic Chemistry: Molecular Approaches to Surface Catalysis (Nato Science Series C:)

Sample text

3. Comparison with model systems. Extrapolation from homogeneous chemistry to surfaces, although risky, provides a basis for molecular-level understanding. For example, crystallographic studies of transition metal clusters containing hydrocarbon ligands have demonstrated the existence of many of the possible C-, H-, and O-containing fragments postulated as catalytic surface intermediates in CO hydrogenation and hydrocarbon conversion. It is important to develop welldefined models of metals, ranging from single atoms, through clusters, to single crystals, to provide the basic concepts upon which the relationships between structure and activity rely.

3. Recommendations 1) Encourage workers in the organometallic community to direct greater creative energies toward developing new models relevant to the elementary steps in heterogeneous catalysis. 2) Encourage theorists toward developing methods applicable to extracting qualitative concepts concerning elementary steps of homogeneous and heterogeneous catalytic reactions. 3) Encourage workers in heterogeneous catalysis and surface science to actively explore the applicability of new molecular concepts being developed in the theoretical and organometallic communities and 28 to utilize the elementary molecular steps in analyzing surface reactions.

2) Encourage theorists toward developing methods applicable to extracting qualitative concepts concerning elementary steps of homogeneous and heterogeneous catalytic reactions. 3) Encourage workers in heterogeneous catalysis and surface science to actively explore the applicability of new molecular concepts being developed in the theoretical and organometallic communities and 28 to utilize the elementary molecular steps in analyzing surface reactions. 4) For designing effective catalysts and effective combinations of multifunctional sites, the following emphasis is particularly recommended: - define the elementary steps of surface reactions and their dependance upon surface site and surface composition; - study the energy redistribution associated with adsorption/desorption and reaction processes; and - examine the mobility of adsorbed molecules and intermediates on solid surfaces.

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