Journal article
Studying the surface reaction between NiO and Al2O3 via total reflection EXAFS (ReflEXAFS).
- Costanzo T INSTM and Department of Chemistry, University of Pavia, I27100 Pavia, Italy.
- Benzi F School of Science and Technology, Geology Division, University of Camerino, I-62032 Camerino, Italy.
- Ghigna P INSTM and Department of Chemistry, University of Pavia, I27100 Pavia, Italy.
- Pin S General Energy Research (ENE), Laboratory for Bioenergy and Catalysis, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
- Spinolo G INSTM and Department of Chemistry, University of Pavia, I27100 Pavia, Italy.
- d'Acapito F CNR-IOM-OGG, c/o ESRF, GILDA-CRG, BP 220, F-38043 Grenoble Cedex, France.
- 2014-02-25
Published in:
- Journal of synchrotron radiation. - 2014
English
The reaction between NiO and (0001)- and (1102)-oriented Al2O3 single crystals has been investigated on model experimental systems by using the ReflEXAFS technique. Depth-sensitive information is obtained by collecting data above and below the critical angle for total reflection. A systematic protocol for data analysis, based on the recently developed CARD code, was implemented, and a detailed description of the reactive systems was obtained. In particular, for (1102)-oriented Al2O3, the reaction with NiO is almost complete after heating for 6 h at 1273 K, and an almost uniform layer of spinel is found below a mixed (NiO + spinel) layer at the very upmost part of the sample. In the case of the (0001)-oriented Al2O3, for the same temperature and heating time, the reaction shows a lower advancement degree and a residual fraction of at least 30% NiO is detected in the ReflEXAFS spectra.
- Language
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- English
- Open access status
- closed
- Identifiers
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- DOI 10.1107/S1600577513031299
- PMID 24562561
- Persistent URL
- https://sonar.ch/global/documents/772
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