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Electrochemical promotion of methane oxidation on impregnated and sputtered Pd catalyst-electrodes deposited on YSZ

Paper ID Volume ID Publish Year Pages File Format Full-Text
46258 46436 2012 10 PDF Available
Title
Electrochemical promotion of methane oxidation on impregnated and sputtered Pd catalyst-electrodes deposited on YSZ
Abstract

The microstructure and electrochemical promotion of thin Pd catalyst-electrodes deposited on yttria-stabilized zirconia (YSZ) prepared either by sputter-deposition or wet impregnation has been studied for the complete oxidation of methane using XRD, XPS and steady state catalytic measurements in conjunction to electrochemical studies at temperatures 350–460 °C under various CH4 to O2 ratios. As prepared sputtered catalyst electrodes, which consist mainly of a Pd metal phase are able to electrochemically promote the CH4 oxidation, while impregnated films, which mainly consist of a PdO phase, can be electropromoted only after in situ reduction. On both types of catalyst-electrodes the reaction exhibits electrophobic behavior under all experimental conditions of this study, i.e. the rate increases moderately with anodic polarization. For sputtered samples, negative current application causes a decrease of the catalytic rate which remains lower than the initial open circuit rate after current interruption. This is a new type of permanent electrochemical promotion and a poisoning index, β, is introduced to quantify the magnitude of this effect.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► As prepared sputtered Pd films on YSZ electrochemically promote CH4 combustion. ► Impregnated Pd films on YSZ electropromote CH4 combustion only after reduction. ► The former exhibit Faradaic efficiencies a factor of 10 higher than the latter. ► Coexistence of PdO and Pd phases needed for catalytic rate and electropromotion.

Keywords
Methane oxidation; Electrochemical promotion; Pd catalyst-electrode; Wet impregnation; Sputtered catalyst-electrodes
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Electrochemical promotion of methane oxidation on impregnated and sputtered Pd catalyst-electrodes deposited on YSZ
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 127, 30 October 2012, Pages 18–27
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