EXAFS evidence for direct Rh-Fe bonding in SiO/sub 2/-supported Rh-Fe bimetallic catalysts

Journal Article · Thu Mar 27 04:00:00 EST 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100398a003· OSTI ID:5828395

Ichikawa, M; Fukushima, T; Yokoyama, T; Kosugi, N; Kuroda, H

Rh K-edge and Fe K-edge EXAFS spectra were observed on Rh-Fe bimetallic catalysts supported on silica, by use of synchrotron radiation. By combining the EXAFS data with the results of Moessbauer spectroscopy, the authors obtained structural models for the catalysts. It is concluded that, in the catalysts of a low Fe/Rh ratio (Fe/Rh = 0.3), Fe atoms are mostly in the state of Fe/sup 3 +/ and are located in the metal-support interface forming bonds with Rh atoms and with oxygen atoms of the support. In the case of a higher Fe/Rh ratio, the excess Fe atoms are in the state of Fe/sup 0/ and are on the surface of metal particles. Discussion is given on the relation between the structures and the catalytic properties. 19 references, 2 figures, 1 table.

• Research Organization: Hokkaido Univ., Sapporo, Japan
• OSTI ID: 5828395
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:7; ISSN JPCHA
• Country of Publication: United States
• Language: English

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CATALYSTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DATA
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
IRON
METALS
MINERALS
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
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OXYGEN COMPOUNDS
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RHODIUM
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SILICON OXIDES
TRANSITION ELEMENTS
X-RAY EMISSION ANALYSIS