Size and pressure independent kinetics of CO oxidation on alumina-supported iridium nanoparticles

Sushchikh, Michael, Cameron, Lucas, Metiu, Horia and McFarland, Eric W. (2008) Size and pressure independent kinetics of CO oxidation on alumina-supported iridium nanoparticles. International Journal of Chemical Kinetics, 40 12: 826-830. doi:10.1002/kin.20354


Author Sushchikh, Michael
Cameron, Lucas
Metiu, Horia
McFarland, Eric W.
Title Size and pressure independent kinetics of CO oxidation on alumina-supported iridium nanoparticles
Journal name International Journal of Chemical Kinetics   Check publisher's open access policy
ISSN 0538-8066
1097-4601
Publication date 2008-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1002/kin.20354
Volume 40
Issue 12
Start page 826
End page 830
Total pages 5
Place of publication Hoboken, NJ United States
Publisher John Wiley and Sons, Inc.
Language eng
Subject 1604 Human Geography
1605 Policy and Administration
1606 Political Science
1303 Specialist Studies in Education
Abstract The gas-phase oxidation of CO catalyzed by iridium was studied under CO-rich reactant conditions over the pressure range 10 -4-10 -2 Pa to investigate the controversial size and pressure dependencies. The reactivity of iridium clusters with an average size of 3 nm was compared to macroscopic metal particles with extended single crystal facets over a range of temperatures (433-573 K), and the apparent activation energies for CO oxidation were consistent with the known activation energies for CO desorption from iridium surfaces. No size-specific dependence of the reaction kinetics was measured, and no indication of the previously reported "pressure gap" was observed. Unlike many other transition metal catalysts, iridium may be used as a model catalyst for CO oxidation in different morphological forms over a range of pressures without invoking a change in the kinetic model.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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