Structural characterization of supported platinum carbonyl clusters by X-ray absorption spectroscopy

Article Abstract:

The Chini-type Pt carbonyl clusters ([Pt3(CO)6](sub n)(super 2-), n=4, 5, 6) and other CO-stabilized Pt clusters were synthesized by gamma-radiolysis, and their structures, when supported on carbon and alpha-alumina, were investigated by X-ray absorption spectroscopy (XAS). It was found that the stacking prismatic structure of triangular units in Chini clusters were transformed, when supported on carbon, into another structure in which the trimeric units are conserved but are arranged in a planar monolayer.

Usage, Absorption spectra, Carbonyl compounds

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Thermodynamic equilibrium compositions, structures, and reaction energies of [Pt.sub.x][O.sub.y] (x = 1-3) clusters from first principles

Article Abstract:

A combination of density functional theory calculations and ab initio thermodynamics are used to examine the equilibrium characteristics of a Pt atom, Pt dimer and Pt trimer confined to an idealized surface and in chemical equilibrium with an oxidizing atmosphere. The models have provided a systematic framework for understanding the compositions and energies of redox reactions of discrete metal clusters of interest in supported and gas-phase nanocatalysis.

Analysis, Nanotechnology, Oxidation-reduction reaction, Oxidation-reduction reactions, Thermal properties

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Isotopic exchange of CO adsorbed on Pt(111)

Article Abstract:

A study was conducted by using polarization modulation IR reflection absorption spectroscopy (PM-IRRAS) and temperature programmed desorption (TPD) on the isotopic exchange of CO adsorbed on Pt(111). The results show that significant isotopic CO exchange takes place on the Pt(111) surface at CO partial pressures down to 10(super -7) mbar.

Adsorption

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