Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 51: Surface chemical reactions I

O 51.6: Vortrag

Donnerstag, 26. März 2009, 17:30–17:45, SCH A01

CO oxidation on planar Au/TiO₂ model catalysts: activation energy and influence of reaction atmosphere — •Menhild Eyrich, Stefan Kielbassa, Joachim Bansmann, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm

The high interest in oxide supported Au catalysts and in particular in the low-temperature CO oxidation reaction on these catalysts, in combination with the still unknown reaction mechanism, has stimulated model studies on planar model catalysts. Analogously to the respective powder catalysts, also the activity of the planar model catalysts strongly depends on the catalyst preparation. Here we report results of reaction measurements on differently reduced Au/TiO₂(110) model catalysts. The activation energy for CO oxidation on these model systems was determined, and the influence of the reactant gas composition (CO/O₂ ratio) on the catalytic activity was evaluated. The results will be compared to the findings for other Au/TiO₂ (model) catalysts, and possible reasons for the significant reactivity enhancement for reduced model catalysts will be discussed.