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In situ study of oxidation states and structure of 4 nm CoPt bimetallic nanoparticles during CO oxidation using X-ray spectroscopies in comparison with reaction turnover frequency

Zheng, Fan; Alayoglu, Selim; Pushkarev, Vladimir V.; Beaumont, Simon K.; Specht, Colin; Aksoy, Funda; Liu, Zhi; Guo, Jinghua; Somorjai, Gabor A.

Authors

Fan Zheng

Selim Alayoglu

Vladimir V. Pushkarev

Colin Specht

Funda Aksoy

Zhi Liu

Jinghua Guo

Gabor A. Somorjai



Abstract

In situ near edge X-ray absorption fine structure (NEXAFS) spectroscopy and ambient pressure X-ray photoelectron spectroscopy (AP-XPS) were performed to monitor the oxidation state and structure of 4 nm CoPt nanoparticles during the reaction of CO with O2 – a model oxidation reaction. In addition, reversible changes in the oxidation state of cobalt as a function of cycling CO and O2 pressure (in the range of millitorr to 60 Torr) were quantified and compared. Turnover frequency reaction data was also obtained for the CoPt nanoparticles and correlated with the oxidation states and structures observed spectroscopically. These findings indicate that separated from the effect of partial pressure of the reactant gases, chemical state and structure changes of the CoPt nanoparticles during CO oxidation are important factors in determining the rate of the reaction.

Citation

Zheng, F., Alayoglu, S., Pushkarev, V. V., Beaumont, S. K., Specht, C., Aksoy, F., …Somorjai, G. A. (2012). In situ study of oxidation states and structure of 4 nm CoPt bimetallic nanoparticles during CO oxidation using X-ray spectroscopies in comparison with reaction turnover frequency. Catalysis Today, 182(1), 54-59. https://doi.org/10.1016/j.cattod.2011.10.009

Journal Article Type Article
Publication Date Mar 17, 2012
Deposit Date Mar 8, 2014
Journal Catalysis Today
Print ISSN 0920-5861
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 182
Issue 1
Pages 54-59
DOI https://doi.org/10.1016/j.cattod.2011.10.009
Keywords In situ X-ray absorption spectroscopy, Ambient pressure X-ray photo-electron spectroscopy, Bimetallic nanoparticles, CoPt alloys, Oxidation states, Cycling pressure, CO oxidation, Turnover frequency.

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