Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 28: Surface reactions II

O 28.2: Vortrag

Dienstag, 28. März 2006, 16:00–16:15, WIL C207

Adsorption and Oxidation of CO on Au/TiO₂ model catalysts — •Thomas Diemant¹, Zhong Zhao¹, Joachim Bansmann¹, Hubert Rauscher², and R. J. Behm¹ — ¹Abt. Oberflächenchemie und Katalyse, Universität Ulm, D-89069 Ulm — ²Institute for Health and Consumer Protection, European Comission, Joint Research Centre, I-21020 Ispra

Metal oxide supported gold catalysts have attracted considerable attention in the last years because of their surprising activity in a number of reactions such as the low temperature CO oxidation. We have studied the interaction of both pure CO and reactive CO/O₂ gas mixtures with planar Au/TiO₂ model catalysts at gas pressures up to 100 mbar and the activity of the model systems for CO oxidation in simultaneous kinetic and in-situ IR measurements (PM-IRAS). The possible evolution of additional surface species (carbonates, formates), which has been observed on real catalysts under similar conditions, was monitored. The results of this work will be compared with results from real catalysts, consequences for the reaction mechanism will be discussed.