Interference phenomena in the EXAFS spectra of Pt-Sn bimetallic catalysts

Article Abstract:

Research was conducted to examine the interference phenomena in the extended X-ray absorption fine structure (EXAFS) spectra of Pt-Sn bimetallic catalysts. The objective of the study is to explain the observed EXAFS spectra as well as to determine the local structure of the metallic phase in the catalysts. Results reveal that the short-distance peak arises from an interference phenomenon that is caused by the coexistence of pure Pt clusters and PtSn alloy. The addition of the individual EXAFS functions result in a good fit that accurately described the metallic phase structure.

Research, Usage, Platinum, Extended X-ray absorption fine structure, Tin

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Zn adsorption on Pd(111): ZnO and PdZn alloy formation

Article Abstract:

The adsorption and thermal deposition of Zn and ZnO on Pd(111) was examined in the temperature range between 300 and 1300K with TDS, LEED and CO adsorption technique. It was found that up to 400K, Zn multilayer adsorption on Pd(111) entirely blocks the CO adsorption sites, between 400 and 600K, multilayer bound Zn desorbs, whereas Zn atoms directly bound to Pd remain on the surface and up to 600K no hints toward alloy formation were detected by CO adsorption or LEED.

Thermal properties, Thin films, Multilayered, Multilayered thin films, Adsorption, Zinc oxide, Chemical properties

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Pt-Co/SiO2 bimetallic planar model catalysts for selective hydrogenation of crotonaldehyde

Article Abstract:

Spin-coating technique was used to prepare surface science models of silica-supported Pt-Co bimetallic catalysts with various Pt/Co ratios. Platinum and cobalt loadings on a series of silica-supported model catalysts were quantified by Rutherford backscattering spectrometry.

Spectra, Hydrogenation, Backscattering

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