Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.94: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Micrometer-scale parallel studies on microstructured model catalysts — •Matthias Roos, Stefan Kielbassa, Menhild Eyrich, Joachim Bansmann, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm
To study mesoscopic effects in catalytic reactions, a spatially resolving scanning mass spectrometer was developed, which allows to quantitatively determine reaction rates above model catalysts. Using microstructured model systems with catalytically active fields separated by inert areas, transport effects will be evaluated from the variation in local reaction rates with size and separation of the active fields [1,2]. Experimental data on microstructured Pt films on SiO2 are presented, and compared with results of simulations. Moreover, first measurements on Au/TiO2 model catalyst are shown.
[1] M. Roos et al., Rev. Sci. Instrum. 78 (2007) 084104
[2] S. Kielbassa et al., Langmuir 20 (2004) 6644