EXAFS evidence for direct Rh-Fe bonding in SiO/sub 2/-supported Rh-Fe bimetallic catalysts
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), Vol. 90:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
10 SYNTHETIC FUELS
IRON
CATALYSTS
CHEMICAL REACTIONS
RHODIUM
EXPERIMENTAL DATA
SILICA
X-RAY EMISSION ANALYSIS
CHALCOGENIDES
CHEMICAL ANALYSIS
DATA
ELEMENTS
INFORMATION
METALS
MINERALS
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SILICON COMPOUNDS
SILICON OXIDES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
090221 - Alcohol Fuels- Chemical Synthesis- (1976-1989)