| Numéro |
J. Phys. Colloques
Volume 47, Numéro C8, Décembre 1986
EXAFS and Near Edge Structure IV
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|---|---|---|
| Page(s) | C8-249 - C8-253 | |
| DOI | https://doi.org/10.1051/jphyscol:1986846 | |
J. Phys. Colloques 47 (1986) C8-249-C8-253
DOI: 10.1051/jphyscol:1986846
CATALYST STRUCTURE STUDIED BY A LABORATORY EXAFS FACILITY : Ru/Al2O3
Y. UDAGAWA1, K. TOHJI1, Z.Z. LIN2, 3, T. OKUHARA2 et M. MISONO21 Institute for Molecular Science, Okazaki, Aichi 444, Japan
2 Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
3 Department of Chemistry, Amoy University, Fujan, China
Abstract
A laboratory EXAFS spectrometer is described which features the utilization of higher order reflections from curved dispersing crystal. With this spectrometer a sufficient performance for structural analyses are obtained in the high energy region up to about 25 keV. It was applied to structurally characterize two kinds of Ru/Al2O3 catalysts, prepared from RuCl3 and Ru3(CO)12, by the Ru K EXAFS, combined with H2 adsorption and EM observations. It was found that Ru metal particles of different sizes were formed depending on the starting material and the procedure. In the catalyst prepared from Ru3(CO)12, small metal particles, possibly consist of about 20 atoms, are formed. They are small enough to show a contraction of the nearest neighbor distance by 0.06 A.