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The role of the WO x ad-component to Pt and PtRu catalysts in the electrochemical CH3OH oxidation reaction

The role of the WO x ad-component to Pt and PtRu catalysts in the electrochemical CH3OH oxidation... High surface area carbon-supported platinum-based catalysts, Pt/C, PtWO x /C, PtRu/C and PtRuWO x /C, were prepared via a chemical reduction route using single metal precursor salts. The catalyst particles were found to be in the nanoscale range, and the addition of Ru clearly decreased the particle size. The Ru was found to be partially incorporated into the face centered cubic lattice of Pt and to form a single Ru catalyst component. X-ray diffraction and X-ray photon spectroscopy did not provide evidence for electronic interactions between WO x and Pt as well as WO x and Ru. However, the addition of tungsten to the PtRuWO x /C catalyst resulted in a high degree of catalyst particle agglomeration. Both Ru containing catalysts showed significantly higher activities for the CH3OH oxidation reaction in terms of Pt + Ru mass as well as electroactive Pt + Ru surface area than the Pt/C and PtWO x /C catalysts. The addition of tungsten appeared to mainly result in some ‘physical’ modification of the catalytically active Pt and Ru surface components such as differences in electroactive surface area rather than promotion of the CH3OH oxidation reaction via a true catalytic mechanism. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Electrochemistry Springer Journals

The role of the WO x ad-component to Pt and PtRu catalysts in the electrochemical CH3OH oxidation reaction

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References (25)

Publisher
Springer Journals
Copyright
Copyright © 2004 by Kluwer Academic Publishers
Subject
Chemistry; Physical Chemistry; Industrial Chemistry/Chemical Engineering; Electrochemistry
ISSN
0021-891X
eISSN
1572-8838
DOI
10.1023/B:JACH.0000016628.81571.f4
Publisher site
See Article on Publisher Site

Abstract

High surface area carbon-supported platinum-based catalysts, Pt/C, PtWO x /C, PtRu/C and PtRuWO x /C, were prepared via a chemical reduction route using single metal precursor salts. The catalyst particles were found to be in the nanoscale range, and the addition of Ru clearly decreased the particle size. The Ru was found to be partially incorporated into the face centered cubic lattice of Pt and to form a single Ru catalyst component. X-ray diffraction and X-ray photon spectroscopy did not provide evidence for electronic interactions between WO x and Pt as well as WO x and Ru. However, the addition of tungsten to the PtRuWO x /C catalyst resulted in a high degree of catalyst particle agglomeration. Both Ru containing catalysts showed significantly higher activities for the CH3OH oxidation reaction in terms of Pt + Ru mass as well as electroactive Pt + Ru surface area than the Pt/C and PtWO x /C catalysts. The addition of tungsten appeared to mainly result in some ‘physical’ modification of the catalytically active Pt and Ru surface components such as differences in electroactive surface area rather than promotion of the CH3OH oxidation reaction via a true catalytic mechanism.

Journal

Journal of Applied ElectrochemistrySpringer Journals

Published: Oct 17, 2004

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