Journal
JOURNAL OF CATALYSIS
Volume 265, Issue 2, Pages 199-208Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2009.05.004
Keywords
CO tolerance; Catalysis; Platinum; Ruthenium; Desorption; Isotope exchange; Temperature dependence; PEM fuel cell
Categories
Funding
- multi-annual programme of the European Commission's joint Research Centre 3
- Framework Programme 6 (FP6) Specific Targeted Research Project (STREP)
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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 degrees C and 150 degrees 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 E-a) for PtRu/C and Pt/C could possibly explain their different degrees of poisoning by CO in proton exchange membrane fuel cells (PEMFCs) 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. (C) 2009 Elsevier Inc. All rights reserved.
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