Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 28: Surface reactions II
O 28.6: Vortrag
Dienstag, 28. März 2006, 17:00–17:15, WIL C207
Methanol steam reforming on Zn/Pd(111) — •Reinhard Denecke, Ercan Ünveren, Armin Reindl, Heiko Wustmann, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen
Hydrogen as energy source for mobile applications can be obtained by steam reforming of methanol over Pd/ZnO catalysts. On other supported Pd catalysts, the addition of Zn increases the selectivity and the rate of hydrogen formation [1].
In order to prepare the active PdZn alloy, 3 or 6 ML Zn are deposited on Pd(111) at 300 K and alloyed at 500 to 600 K. The adsorption of methanol and consequently the reaction with water at different temperatures are investigated in-situ in a pressure range from ultra-high-vacuum up to 0.3 mbar by No-dqhigh-pressureNo-dq X-ray photoelectron spectroscopy [2]. For methanol adsorption, CHxO (x=0-3) and CH3OH species are found on the catalyst surface. In contrast to Pd(111), nearly no dissociation to CHx was observed, suggesting different reaction pathways. Coadsorption of methanol and water leads to reduced intensity of the CHxO (x=0-3) species, signalling a reaction process. Gas phase analysis complements these results. Supported by DFG (SPP 1091).
[1] N. Iwasa et al., J. Chem. Eng. Japan 37 (2004) 286
[2] J. Pantförder et al., Rev. Sci. Instrum. 76 (2005) 014102