Nanoscale structure of oxidized and reduced rhodium-loaded ZrO2–CeO2 catalysts

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DOIResolve DOI: http://doi.org/10.1021/jp112272c
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TypeArticle
Journal titleThe Journal of Physical Chemistry C
Volume115
Issue29
Pages1417314179; # of pages: 7
Subjectceria-zirconia; fine structures; nanoscale structure; particle reduction; reducing atmosphere
AbstractTransmission electron microscopy (TEM) was used to investigate microstructure and chemistry of Rh-loaded ZrO 2-CeO 2 catalyst exposed to oxidizing and two types of reducing atmospheres. In the oxidized sample Rh was dispersed on the ceria-zirconia support, while metallic Rh was precipitated in both H 2 and CO reduced samples. The size distribution of Rh particles in the H 2-reduced sample is narrower than in samples reduced in CO. Electron energy-loss spectroscopy (EELS) fine structure indicates that both Ce 4+ and Ce 3+ coexist in the oxidized sample while the reduced sample appears to be predominantly Ce 3+. We discuss the orientation relations of Rh and the ceria-zirconia support and the formation of superstructure in ceria-zirconia support in the reduced samples. We also briefly discuss the thermodynamics of the Rh particle reduction and on ordering in the yttrium/lanthanum-doped ceria-zirconia.
Publication date
LanguageEnglish
AffiliationNational Institute for Nanotechnology; National Research Council Canada
Peer reviewedYes
NPARC number19734707
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Record identifier9436bfec-dfec-40af-86fd-22c9f96a990f
Record created2012-04-19
Record modified2017-03-23
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