Preparation and Characterization of Silica Supported Au−Pd Model Catalysts

Preparation and Characterization of Silica Supported Au−Pd Model Catalysts

Au−Pd bimetallic model catalysts were synthesized as alloy clusters on SiO2 ultrathin films under ultrahigh vacuum (UHV) conditions. The surface composition and morphology were characterized with low energy ion scattering spectroscopy (LEIS), infrared reflection absorption spectroscopy (IRAS), and t...

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Veröffentlicht in:The journal of physical chemistry. B 2005-12, Vol.109 (49), p.23517-23522
Hauptverfasser: Luo, K, Wei, T, Yi, C.-W, Axnanda, S, Goodman, D. W
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container_end_page 23522
container_issue 49
container_start_page 23517
container_title The journal of physical chemistry. B
container_volume 109
creator Luo, K
Wei, T
Yi, C.-W
Axnanda, S
Goodman, D. W
description Au−Pd bimetallic model catalysts were synthesized as alloy clusters on SiO2 ultrathin films under ultrahigh vacuum (UHV) conditions. The surface composition and morphology were characterized with low energy ion scattering spectroscopy (LEIS), infrared reflection absorption spectroscopy (IRAS), and temperature programmed desorption (TPD). Relative to the bulk, the surface of the clusters is enriched in Au. With CO as a probe, IRAS and TPD were used to identify isolated Pd sites at the surface of the supported Au−Pd clusters. Ethylene adsorption and dehydrogenation show a clear structure−reactivity correlation with respect to the structure/composition of these Au−Pd model catalysts.
doi_str_mv 10.1021/jp0553131
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title Preparation and Characterization of Silica Supported Au−Pd Model Catalysts
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