Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 15: Heterogeneous catalysis I

O 15.3: Vortrag

Montag, 26. März 2012, 16:30–16:45, MA 042

CO oxidation reaction on mesoporous Au/TiO₂ model catalysts - a kinetic and spectroscopic study — •Matthias Roos¹, Dominique Böcking², Kwabena Offeh Gyimah¹, Gabriela Kucerova¹, Joachim Bansmann¹, Nicola Hüsing^2,3, and R. Jürgen Behm¹ — ¹Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany — ²Institute of Inorganic Chemistry II, Ulm University, D-89069 Ulm, Germany — ³Materials Chemistry, Paris-Lodron University, A-5020 Salzburg, Austria

Ultrathin mesoporous Au/TiO₂ layers of about 150 nm thickness, can be considered as a close-to-realistic model system for realistic Au/TiO₂ catalysts. Their catalytic properties towards the CO oxidation reaction were studied using two different types of reactors, which have been developed for kinetic measurements on low surface area model catalysts. A locally resolving and differentially pumped mass spectrometer was used to determine reaction parameters like reaction orders and the activation energy of the samples [1,2]. In order to measure absolute reaction rates, a micro flow tube reactor was developed, based on the design by K. Wong et al. [3], which was optimized for the CO oxidation on mesoporous Au/TiO₂ film samples. Furthermore, infra red spectroscopic measurements were performed to investigate the accumulation of stable carbon based species on the sample surface, such as surface carbonates, as potential origin for the observed deactivation.
M. Roos et al., J. Chem. Phys. 133, 2010, 94504.
M. Roos et al., Beilstein J. Nanotechnol. 2, 2011, 593.
K. Wong et al., Faraday Discuss. 105, 1996, 237.