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Solving the structure of reaction intermediates by time-resolved synchrotron x-ray absorption spectroscopy
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10.1063/1.3040271
/content/aip/journal/jcp/129/23/10.1063/1.3040271
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/23/10.1063/1.3040271

Figures

Image of FIG. 1.
FIG. 1.

PCA illustrating the method of trapping a reaction intermediate: (a) TR XANES of reduction of showing the structural evolution during the reaction (the arrow indicates reaction direction); (b) the first five components from PCA calculation weighted by eigenvalues; (c) representative spectrum (in dots) superimposed with the linear combination of two components (solid line); the arrows point to the largest misfits; (d) residual plots resulted from a two-component fit [the arrow points to the time stamp of intermediate]; (e) representative spectrum (dots) superimposed with the linear combination of three components (solid); (f) residual plot resulted from a three-component fit.

Image of FIG. 2.
FIG. 2.

TR mixing fractions of the start, the end, and the intermediate phase (when present) during the reduction of Cu-doped ceria at (a), and reoxidation of Cu-doped ceria at (b).

Image of FIG. 3.
FIG. 3.

Cu -edge XANES and -weighted EXAFS (inset) data extracted by PCA for the reaction intermediate during the TR reduction of Cu-doped ceria at (a); Fourier transform magnitudes of the data (dots) and FEFF6 fit (solid) of the intermediate phase (b).

Tables

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Table I.

EXAFS results obtained by FEFF6 fitting analysis of the reaction phases during hydrogen reduction reaction of Cu/ceria system at . Given also are relevant quantities obtained here for the following references: CuO, , and Cu at room temperature.

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/content/aip/journal/jcp/129/23/10.1063/1.3040271
2008-12-15
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Solving the structure of reaction intermediates by time-resolved synchrotron x-ray absorption spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/23/10.1063/1.3040271
10.1063/1.3040271
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