Electrooxidation of acetaldehyde on carbon-supported Pt, PtRu and Pt 3Sn and unsupported PtRu0.2 catalysts: A quantitative DEMS study

被引：0
|
作者：
Wang, H. [1 ]
Jusys, Z. [1 ]
Behm, R.J. [1 ]
机构：
[1] Department Surface Chemistry and Catalysis, University of Ulm, D-89069, Ulm, Germany
来源：
Journal of Applied Electrochemistry | 2006年 / 36卷 / 11期
关键词：
The oxidation of acetaldehyde on carbon supported Pt/Vulcan; PtRu/Vulcan and Pt3Sn/Vulcan nanoparticle catalysts and; for comparison; on polycrystalline Pt and on an unsupported PtRu0.2 catalyst; was investigated under continuous reaction and continuous electrolyte flow conditions; employing electrochemical and quantitative differential electrochemical mass spectroscopy (DEMS) measurements. Product distribution and the effects of reaction potential and reactant concentration were investigated by potentiodynamic and potentiostatic measurements. Reaction transients; following both the Faradaic current as well as the CO2 related mass spectrometric intensity; revealed a very small current efficiency for CO 2 formation of a few percent for 0.1 m acetaldehyde bulk oxidation under steady-state conditions on all three catalysts; the dominant oxidation product being acetic acid. Pt alloy catalysts showed a higher activity than Pt/Vulcan at lower potential (0.51 V); but do not lead to a better selectivity for complete oxidation to CO2. C-C bond breaking is rate limiting for complete oxidation at potentials with significant oxidation rates for all three catalysts. The data agree with a parallel pathway reaction mechanism; with formation and subsequent oxidation of COad and CH x; ad species in the one pathway and partial oxidation to acetic acid in the other pathway; with the latter pathway being; by far; dominant under present reaction conditions. © Springer Science+Business Media B.V. 2006;
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页码：1187 / 1198
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