Electrochemical promotion of NO reduction by hydrogen on a platinum/polybenzimidazole catalyst

Irina Petrushina, Viktor Bandur, Frederik Vilhelm Cappeln, Niels Bjerrum, Rasmus Zink Sørensen, R.H. Refshauge, Qingfeng Li

Research output: Contribution to journalJournal articleResearchpeer-review

357 Downloads (Pure)

Abstract

The electrochemical promotion of catalytic NO reduction by hydrogen was studied using a (NO, H-2, Ar), Pt polybenzimidazole (PBI)-H3PO4\Pt, (H-2, Ar) fuel cell at 135degreesC. A mixture of NO/H-2/Ar was used as the working mixture at one electrode and a mixture of H-2/Ar was used as reference and counter gas at the other electrode. Products of NO reduction (N-2 and H2O) were analyzed by an on-line mass spectrometer. At high NO+H-2+Ar flow rate (17 mL/min; 17 and 354 mL/min, respectively, at atmospheric pressure) the maximum rate enhancement ratio was 4.65. At low NO+H-2+Ar flow rate (17 mL/min; 17 and 140 mL/min, respectively), NO reduction increased 20 times even without polarization compared to the high gas flow rate. The electrochemical promotion effect occurs at positive polarization with a maximum increase at approximately 0.08 V and with 1.5 times the zero polarization value. The promotion at the negative polarization can be attributed to the electrochemical production of the promoters. At low gas flow rates, a charge-induced change of the strength of chemisorptive bonds can take place.
Original languageEnglish
JournalJournal of The Electrochemical Society
Volume150
Issue number5
Pages (from-to)D87-D90
ISSN0013-4651
DOIs
Publication statusPublished - 2003

Bibliographical note

Copyright The Electrochemical Society, Inc. [2003]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

Fingerprint Dive into the research topics of 'Electrochemical promotion of NO reduction by hydrogen on a platinum/polybenzimidazole catalyst'. Together they form a unique fingerprint.

Cite this