Electrochemical promotion of oxidative coupling of methane on platinum/polybenzimidazole catalyst

Publication: Research - peer-reviewJournal article – Annual report year: 2002

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@article{f846fd5622874e1abddfe431faff9b63,
title = "Electrochemical promotion of oxidative coupling of methane on platinum/polybenzimidazole catalyst",
publisher = "Electrochemical Society, Inc.",
author = "Irina Petrushina and Viktor Bandur and Niels Bjerrum and Cappeln, {Frederik Vilhelm} and Qingfeng Li",
note = "Copyright The Electrochemical Society, Inc. [2002]. 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).",
year = "2002",
doi = "10.1149/1.1504455",
volume = "149",
number = "10",
pages = "D143--D147",
journal = "Electrochemical Society. Journal",
issn = "0013-4651",

}

RIS

TY - JOUR

T1 - Electrochemical promotion of oxidative coupling of methane on platinum/polybenzimidazole catalyst

A1 - Petrushina,Irina

A1 - Bandur,Viktor

A1 - Bjerrum,Niels

A1 - Cappeln,Frederik Vilhelm

A1 - Li,Qingfeng

AU - Petrushina,Irina

AU - Bandur,Viktor

AU - Bjerrum,Niels

AU - Cappeln,Frederik Vilhelm

AU - Li,Qingfeng

PB - Electrochemical Society, Inc.

PY - 2002

Y1 - 2002

N2 - The electrochemical promotion of catalytic methane oxidation was studied using a (CH4,O-2,Ar), Pt\polybenzimidazole (PBI)-H3PO4\Pt,(H-2,Ar) fuel cell at 135degreesC. It has been found that C2H2, CO2, and water are the main oxidation products. Without polarization the yield of C2H2 was 0.9% and the yield of CO2 was 7.3%. This means that C-2 open-circuit selectivity was approximately 11%. Open-circuit voltage was around 0.6 V. It has been shown that the CH4 --> C2H2 catalytic reaction can be electrochemically promoted at negative polarization and exhibits a clear "volcano-type'' promotion behavior, meaning that there was a maximum promotion effect at a polarization of -0.15 V, or 0.45 V catalyst potential vs. a hydrogen electrode (3.8% C2H2 yield). The catalytic rate enhancement ratio, r(C-2)/r(o)(C-2), at this maximum was 4.2. There was no C2H2 production at polarization greater than or equal to0.1 and less than or equal to-0.3 V. The yield of C2H2 decreased with decreasing temperature. Dependence of CO2 yield on polarization also showed a "volcano-type'' behavior with maximum yield of 8.3% at -0.15 V polarization. The catalytic rate enhancement ratio for CO2 production, r(CO2)/r(o)(CO2), at this maximum was 1.1, which means that this catalytic reaction is only slightly affected by the electrochemical polarization. This indicates that polarization especially affects the C-2 selectivity of the catalyst. The obtained data was explained by the electrochemical production of Pt-H active centers at the electrolyte-catalyst-gaseous reactant interface (lambda much greater than 1).

AB - The electrochemical promotion of catalytic methane oxidation was studied using a (CH4,O-2,Ar), Pt\polybenzimidazole (PBI)-H3PO4\Pt,(H-2,Ar) fuel cell at 135degreesC. It has been found that C2H2, CO2, and water are the main oxidation products. Without polarization the yield of C2H2 was 0.9% and the yield of CO2 was 7.3%. This means that C-2 open-circuit selectivity was approximately 11%. Open-circuit voltage was around 0.6 V. It has been shown that the CH4 --> C2H2 catalytic reaction can be electrochemically promoted at negative polarization and exhibits a clear "volcano-type'' promotion behavior, meaning that there was a maximum promotion effect at a polarization of -0.15 V, or 0.45 V catalyst potential vs. a hydrogen electrode (3.8% C2H2 yield). The catalytic rate enhancement ratio, r(C-2)/r(o)(C-2), at this maximum was 4.2. There was no C2H2 production at polarization greater than or equal to0.1 and less than or equal to-0.3 V. The yield of C2H2 decreased with decreasing temperature. Dependence of CO2 yield on polarization also showed a "volcano-type'' behavior with maximum yield of 8.3% at -0.15 V polarization. The catalytic rate enhancement ratio for CO2 production, r(CO2)/r(o)(CO2), at this maximum was 1.1, which means that this catalytic reaction is only slightly affected by the electrochemical polarization. This indicates that polarization especially affects the C-2 selectivity of the catalyst. The obtained data was explained by the electrochemical production of Pt-H active centers at the electrolyte-catalyst-gaseous reactant interface (lambda much greater than 1).

UR - http://dx.doi.org/10.1149/1.1504455

U2 - 10.1149/1.1504455

DO - 10.1149/1.1504455

JO - Electrochemical Society. Journal

JF - Electrochemical Society. Journal

SN - 0013-4651

IS - 10

VL - 149

SP - D143-D147

ER -