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CO desorption kinetics at concentrations and temperatures relevant to PEM fuel cells operating with reformate gas and PtRu/C anodes

Paper ID Volume ID Publish Year Pages File Format Full-Text
42141 45912 2010 8 PDF Available
Title
CO desorption kinetics at concentrations and temperatures relevant to PEM fuel cells operating with reformate gas and PtRu/C anodes
Abstract

The kinetics of the CO desorption process have been determined using isotopic exchange experiments at concentrations and temperatures relevant to PEM fuel cells operating with reformate gas and commercial carbon supported platinum–ruthenium alloy anodes. The CO desorption kinetics have been studied as a function of CO concentration, temperature and flow rate. Desorption rate constants have been determined experimentally for a wide range of concentrations (100–500 ppm) and temperatures (25–150 °C) and have been extrapolated to one order of magnitude lower CO concentration range between 10 and 100 ppm, which is directly relevant to PEM fuel cells operating with reformate gas. The desorption rates measured for the 100–500 ppm CO concentration range appear to be significantly larger than previously published CO oxidation data, suggesting that the CO desorption process plays a more significant role in determining the equilibrium CO coverage at the fuel cell anode than the electrochemical CO oxidation process. The proposed desorption rate values at the lower 10–100 ppm CO concentration range and at relevant temperatures are believed to be of added value for the modelling of PEM fuel cells operating with reformate gas and PtRu/C anodes, since significantly different empirical values have been used up to now for the modelling of the CO desorption process. The variation of the apparent Arrhenius parameters as a function of CO concentration provides also some insight into the CO poisoning effect and the underlying adsorption/desorption processes.

Graphical abstractThe kinetics of the CO desorption process have been determined using isotopic exchange experiments at concentrations and temperatures relevant to PEM fuel cells operating with reformate gas and PtRu/C anodes. The proposed desorption rate values at the lower 10–100 ppm CO concentration range and at relevant temperatures are believed to be of added value for the modelling of PEM fuel cells operating with reformate gas.Figure optionsDownload full-size imageDownload high-quality image (78 K)Download as PowerPoint slide

Keywords
CO tolerance; Catalysis; Platinum; Ruthenium; Desorption; Isotope exchange; Temperature dependence; Concentration dependence; Proton exchange membrane fuel cell; Modelling; Reformate gas
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CO desorption kinetics at concentrations and temperatures relevant to PEM fuel cells operating with reformate gas and PtRu/C anodes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 374, Issues 1–2, 1 February 2010, Pages 95–102
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us