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O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.126: Poster
Wednesday, March 16, 2011, 17:30–21:00, P4
CO oxidation reaction on thin mesoporous Au/TiO2 layers — •Matthias Roos1, Dominique Böcking2, Kwabena Offeh Gyimah1, Gabriela Kucerova1, Joachim Bansmann1, Nicola Hüsing2,3, and R. Jürgen Behm1 — 1Institute of Surface Chemistry and Catalysis, Ulm University, D-89069, Germany — 2Institut für Anorganische Chemie II, Ulm University, D-89069, Germany — 3Abteilung Materialchemie, Universität Salzburg, A-5020, Austria
The catalytic properties of thin homogeneous layers of mesoporous Au/TiO2 [1] deposited onto silicon substrates to study the CO oxidation reaction was investigated. The mesoporous TiO2 layers are fabricated using a sol-gel process followed by the precipitation-deposition of Au nanoparticles. The measurements on the catalytic activity were performed in a vacuum system using a quadrupole mass spectrometer which allows to collect the reaction gases very close to a specific region on the surface [2]. Using this setup, the activation energy and the reaction orders of CO and O2 were measured and compared to respective measurements on planar Au/TiO2(110) model catalysts and standard Au/TiO2 powder catalysts. Furthermore, the catalytic stability and the deactivation behaviour of the mesoporous Au/TiO2 films was studied. To test the accessibility by reaction gases of deeper lying regions within the catalytically active films, the thickness of the TiO2 layers was varied for different measurements.
[1] Y. Denkwitz et al., Appl. Cat. B 91 (2009) 470
[2] M. Roos et al., J. Chem. Phys. 133 (2010) 094504