Journal article
Adsorptive and catalytic properties of supported metal oxides: 1. Moessbauer spectroscopy of supported iron oxides
Journal of physical chemistry (1952), Vol.90(9), pp.1863-1871
04/01/1986
DOI: 10.1021/j100400a026
Abstract
Mössbauer spectroscopy was used to characterize iron oxide supported on SiO2, Al2O3, TiO2, MgO, and ZnO following treatments in CO/CO2 gas mixtures at 660 K. At low iron loadings (ca. 1%), ferrous cations were present in sites of high coordination (e.g., 5- or 6-fold) at the surfaces of all of the supports, and these cations gave rise to a Mössbauer spectroscopy doublet with a quadrupole splitting of about 2 mm/s at room temperature. Additional doublets with smaller splittings were observed in the spectra of ferrous cations on SiO2 and MgO. This was due to the presence of ferrous cations in sites of lower coordination (e.g., 3- or 4-fold) on silica and due to ferrous cations in the bulk structure of magnesia. Ferrous cations on Al2O3, TiO2, and SiO2 were stable against oxidation to Fe3+. The Fe3+/Fe2+ ratio on MgO was sensitive to the CO/CO2 gas-phase composition. At higher iron loadings (ca. 25%), FeTiO3 was detected on TiO2 and magnetite particles were observed on SiO2 and Al2O3. These results are interpreted in terms of the formation of surface compounds between iron oxide and the various supports.
Details
- Title: Subtitle
- Adsorptive and catalytic properties of supported metal oxides: 1. Moessbauer spectroscopy of supported iron oxides
- Creators
- D. G RethwischJames A Dumesic
- Resource Type
- Journal article
- Publication Details
- Journal of physical chemistry (1952), Vol.90(9), pp.1863-1871
- DOI
- 10.1021/j100400a026
- ISSN
- 0022-3654
- eISSN
- 1541-5740
- Publisher
- American Chemical Society
- Language
- English
- Date published
- 04/01/1986
- Academic Unit
- Chemical and Biochemical Engineering
- Record Identifier
- 9984003412302771
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