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Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 4: Heterogeneous catalysis I

O 4.6: Vortrag

Montag, 22. März 2010, 12:30–12:45, H33

Oxidation of carbon monoxide on Au/ZnO nanoparticles: an infrared spectroscopy study — •Heshmat Noei1, Martin Muhler1, and Yuemin Wang1,21Lehrstuhl für Technische Chemie, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 2Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany

Recently, supported gold nanoparticles have attracted enormous attention due to their unique catalytic properties for a number of chemical reactions including CO oxidation at low temperatures. In this contribution the catalytic reactivity of different ZnO-supported Au nanoparticles was studied systematically by ultra-high vacuum FTIR spectroscopy (UHV-FTIRS). Exposing negatively charged Au nanoparticles to CO at 110 K leads to the appearance of two C-O stretching bands at 2180 and 2066 cm−1, which are assigned to CO species adsorbed on ZnO and Au surfaces, respectively. On oxidized Au/ZnO (with Au0) the IR band for CO adsorption on ZnO is observed at 2183 cm−1, while two new C-O bands show up at 2105 and 2112 cm−1, which are attributed to the CO species adsorbed on Au/ZnO interface and Au particles, respectively. After further exposing the reduced and oxidized Au/ZnO nanopartcles to oxygen at 110 K, CO oxidation occurs yielding physisorbed CO2 and carbonate species. It was found that the reduced surfaces favour CO2 production, whereas on the oxidized surfaces carbonate species are preferentially formed. The catalytic mechanisms of low temperature CO oxidation will be discussed in details.

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