Kinetic Study of CO Desorption from PtRu/C PEM Fuel Cell Anodes - Temperature Dependence and Associated Microstructural Transformations
The temperature dependence of the CO desorption process on a carbon supported platinum-ruthenium alloy catalyst has been investigated using isotopic exchange experiments. The kinetics of CO desorption on PtRu/C catalyst have been studied as a function of temperature and flow rate. Desorption rate constants have been determined for a temperature range between 25°C and 150°C. All PtRu/C results have been compared with those obtained for the Pt/C catalyst under similar experimental conditions. Quite different desorption rate constants have been observed. The variation in apparent Arrhenius parameters (frequency factor A and activation energy Ea) for PtRu/C and Pt/C could possibly explain their different degrees of poisoning by CO in Proton Exchange Membrane Fuel Cells (PEMFC) and the underlying adsorption/desorption processes. The effect of temperature treatment on the PtRu/C catalyst properties has also been investigated with respect to CO desorption kinetics and to the associated microstructural transformations.
PITOIS Aurelien;
DAVIES Jon;
PILENGA Alberto;
PFRANG Andreas;
TSOTRIDIS Georgios;
2009-07-07
ACADEMIC PRESS INC ELSEVIER SCIENCE
JRC50049
0021-9517,
www.elsevier.com/locate/jcat,
https://publications.jrc.ec.europa.eu/repository/handle/JRC50049,
10.1016/j.jcat.2009.05.004,
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