Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.58: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Micro-flow tube reactor for investigations on the catalytic activity of model catalysts — Kwabena Offeh Gyimah, Matthias Roos, •Joachim Bansmann, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm

Here, we report on a newly developed glass reactor for investigating the catalytic activity of model catalysts which usually exhibit very small surface areas and, as a consequence, very low reactions rates. The design of the reactor is based on a reactor developed by Wong et al. [1], it is fabricated from glass, allows temperatures up to 400^∘C, and is connected to a quadrupole mass spectrometer. Due to its small reaction volume, it is only suitable for small samples (e.g., 3mm x 3mm). The reactor has been tested for the CO oxidation reaction on thin film based Au/TiO₂ catalysts [2] in the pressure regime of several mbars (CO and O₂). Due to its design, it allows fast measurements on the activation energy of catalysts. The properties of this reactor will be compared to other reactors, e.g. [1,3].

[1] K. Wong et al., Faraday Discuss. 105 (1996) 237. [2] M. Roos et al., Beilstein J. Nanotechnology 2 (2011) 593. [3] M. Eyrich et al., ChemPhysChem 11 (2010) 1430.