Oxametallacycle intermediates on clean and Cs-promoted Ag(111) surfaces

Article Abstract:

The density functional theory calculations for a model cluster representative of the [111] face of Ag is performed to investigate the effect of Cs and Cs(super +) on a proposed oxametallacycle intermediate of ethylene epoxidation. It was observed that ethylene binds to an oxygen atom on an Ag cluster to make a bound -O-C2H4 species and in both Cs-promoted cases, oxametallocycle is, within the errors of calculations, isoenergetic with respect to the desorption of ethylene with the O atom remaining bound to the promoted Ag cluster.

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Oxidation states of gold in MgO-supported complexes and clusters: characterization by X-ray absorption spectroscopy and temperature-programmed oxidation and reduction

Article Abstract:

The use of X-ray absorption near edge structure (XANES) spectroscopy, temperature-programmed reduction (TPR) and temperature-programmed oxidation (TPO), is the main aim of this study. The oxidation states of gold in magnesium oxide are characterized by these methods.

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Observation of the adsorption of K+Au (CN) 2- ion pairs on the surface of nanoporous carbon by XANES

Article Abstract:

A novel experiment has been designed by treating the adsorbed species on carbon surface. The unpaired adsorption has been partly suppressed by the presence of the Ca (super 2+) ions.

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