Flame-synthesized ceria-supported copper dimers for preferential oxidation of CO

Kydd, R., Teoh, W. Y., Wong, K., Wang, Y., Scott, J., Zeng, Q.-H., Yu, A.B., Zou, J. and Amal, R. (2009) Flame-synthesized ceria-supported copper dimers for preferential oxidation of CO. Advanced Functional Materials, 19 3: 369-377. doi:10.1002/adfm.200801211

Author Kydd, R.
Teoh, W. Y.
Wong, K.
Wang, Y.
Scott, J.
Zeng, Q.-H.
Yu, A.B.
Zou, J.
Amal, R.
Title Flame-synthesized ceria-supported copper dimers for preferential oxidation of CO
Journal name Advanced Functional Materials   Check publisher's open access policy
ISSN 1616-301X
Publication date 2009-02-10
Year available 2008
Sub-type Article (original research)
DOI 10.1002/adfm.200801211
Volume 19
Issue 3
Start page 369
End page 377
Total pages 9
Editor Flanagan, D.
Place of publication Weinheim, Germany
Publisher Wiley-VCH Verlag GmbH
Language eng
Subject C1
030306 Synthesis of Materials
100712 Nanoscale Characterisation
970102 Expanding Knowledge in the Physical Sciences
970109 Expanding Knowledge in Engineering
970110 Expanding Knowledge in Technology
Formatted abstract
Rapid synthesis of CuCeO2 catalysts by flame spray pyrolysis produces highly active Cu dimer morphologies without the need for additional catalyst pretreatment. The active Cu component is enriched onto the CeO2 surface at concentrations higher than the nominal loading with no evidence of amorphous or crystalline CuO phase. Increasing the Cu content results in a morphological transition from isolated Cu monomers to oxygen-bridged dimers and an associated increase in oxygen vacancy concentration. Dimer-containing CuCeO2 catalysts display high levels of activity and selectivity in the low-temperature preferential oxidation of CO. Experimental measurements and simulations suggest that the geometry of the dimer presents a comparatively ionic CuO bond at the catalyst surface. Further studies indicate that these ionic dimer species promote preferential CO oxidation at lower temperatures than observed for monomeric Cu species. This is the first report to explicitly propose and demonstrate that the structural distortion associated with the formation of Cu dimers directly induces increased bond ionicity at the catalyst surface and that these changes are responsible for improved catalytic activity.
Keyword ceria
flame spray pyrolysis
structure-property relationship
x-ray photoelectron
Q-Index Code C1
Q-Index Status Provisional Code
Additional Notes Published Online: 2 Dec 2008.

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Created: Thu, 03 Sep 2009, 08:37:55 EST by Mr Andrew Martlew on behalf of School of Mechanical and Mining Engineering