•S. Pöllmann1, J. Pantförder1, A. Kölbl2,
P. Pfeifer2, M. Fichtner3, D. Borgmann1,
R. Denecke1 und H.-P. Steinrück1
1Physikalische Chemie II, Universität Erlangen, Egerlandstr.
3, 91058 Erlangen.
2FZ Karlsruhe GmbH, Institut für Mikroverfahrenstechnik
-IMVT-, Postfach 3640, 76021 Karlsruhe.
3FZ Karlsruhe GmbH, Institut für Nanotechnologie -INT-,
Postfach 3640, 76021 Karlsruhe.
We studied the chemical composition and the temperature dependent behavior
of Pd/Zn/ZnO catalysts that are used for methanol steam reforming. Real
catalysts coated on microstructured foils have been used and their performance
has been characterised in a high pressure flow apparatus under realistic
reaction conditions. We investigated these samples by means of X-ray photoelectron
spectroscopy (XPS) with Al Ka radiation. Utilizing
a high pressure XPS system the experiments were performed
in-situ and in the presence of methanol and water vapour in a pressure
range up to 1 mbar, at different temperatures. These measurements allow
to establish a correlation between the different activities for the methanol
steam reforming and the chemical composition of the catalysts surface.
Supported by the DFG (Schwerpunktsprogramm 1091, Ste 620/3-3, Fi 816/1-1,2)