Adsorptive and catalytic properties of supported metal oxides. 2. Infrared spectroscopy of nitric oxide adsorbed on supported iron oxides
Infrared spectroscopy of adsorbed nitric oxide was used to probe the nature of ferrous cations supported at low loadings (ca. 1%) on SiO/sub 2/, Al/sub 2/O/sub 3/, TiO/sub 2/, MgO, and ZnO. Ferrous cations on all of these supports gave rise to two mononitrosyl species, which appear in infrared spectra near 1810 and 1750 cm/sup -1/. These bands are attributed to ferrous cations of different coordination, with the band at lower frequency due to cations of lower coordination. Dinitrosyl species were observed on silica-supported iron, giving rise to a pair of infrared bands at 1900 and 1790 cm/sup -1/. These can be attributed to the adsorption of two NO molecules by a ferrous cation which is highly coordinatively unsaturated. These dinitrosyl species may also be present to a small extent on titania-supported iron. It is suggested that the coordination number of the supported ferrous cation is lower on oxide supports for which the coordination number of the oxygen anions is lower. 23 references, 8 figures, 1 table.
- Research Organization:
- Univ. of Wisconsin, Madison
- OSTI ID:
- 6038788
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 90:8
- Country of Publication:
- United States
- Language:
- English
Similar Records
FTIR spectroscopy of nitric oxide adsorption on Pd/Al{sub 2}O{sub 3}: Evidence of metal-support interaction
Infrared and Moessbauer spectroscopy studies of the interaction of NO with iron-exchanged zeolites
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
CATALYTIC EFFECTS
SORPTIVE PROPERTIES
IRON OXIDES
MAGNESIUM OXIDES
NITRIC OXIDE
ABSORPTION SPECTROSCOPY
SILICON OXIDES
TITANIUM OXIDES
ZINC OXIDES
CATALYST SUPPORTS
CATALYSTS
COORDINATION NUMBER
EXPERIMENTAL DATA
INFRARED SPECTRA
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
DATA
INFORMATION
IRON COMPOUNDS
MAGNESIUM COMPOUNDS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
400201* - Chemical & Physicochemical Properties