DEMS Analysis of Small Organic Molecule Electrooxidation: A High-Temperature High-Pressure DEMS study

被引:16
作者
Jusys, Z. [1 ]
Behm, R. J. [1 ]
机构
[1] Univ Ulm, Inst Catalysis & Surface Chem, D-89069 Ulm, Germany
来源
PROTON EXCHANGE MEMBRANE FUEL CELLS 8, PTS 1 AND 2 | 2008年 / 16卷 / 02期
关键词
D O I
10.1149/1.2981965
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The electrooxidation of methanol, ethanol and ethylene glycol on a Pt/Vulcan catalyst was investigated over a wide temperature range [20 to 100 degrees C] at 3 bar overpressure and under continuous electrolyte flow by differential electrochemical mass spectrometry [DEMS]. Oxidation of methanol, ethanol and ethylene glycol at 0.6 V at ambient temperatures yields CO2 current efficiencies of similar to 40, 5 and 4%, which increase to 100, 24 and 33% at 100 degrees C, respectively. The apparent activation energies for the overall reaction and for oxidation to CO2 were found to be 58 and 64 kJ mol(-1) for methanol oxidation, for ethanol / ethylene glycol they were 41 / 32 kJ mol(-1) and 73 / 53 kJ mol(-1), respectively. The mechanistic and kinetic implications of these data and the importance of model studies under realistic reaction conditions will be discussed.
引用
收藏
页码:1243 / 1251
页数:9
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