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Get Free AccessIn 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.
Fan Zheng, Selim Alayoǧlu, V.V. Pushkarev, Simon K. Beaumont, Colin Specht, Funda Aksoy, Zhi Liu, Jinghua Guo, Gabor Somorjai (2011). In situ study of oxidation states and structure of 4nm CoPt bimetallic nanoparticles during CO oxidation using X-ray spectroscopies in comparison with reaction turnover frequency. , 182(1), DOI: https://doi.org/10.1016/j.cattod.2011.10.009.
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Type
Article
Year
2011
Authors
9
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.1016/j.cattod.2011.10.009
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