Effect of molybdenum addition to Rh/SiO/sub 2/ catalysts: appearance of a second rhodium dicarbonyl species
Journal Article
·
· J. Phys. Chem.; (United States)
The effects of molybdenum addition to silica-supported rhodium have been studied by using infrared spectroscopy. A new rhodium dicarbonyl species with characteristic bands at 2110 and 2052 cm/sup -1/ was observed during treatment of Rh-Mo/SiO/sub 2/ catalysts with CO at room temperature following reaction of nitric oxide with CO over the catalysts at 200/sup 0/C. These bands are approximately 15 cm/sup -1/ higher than the bands usually reported for the rhodium dicarbonyl species. Infrared spectra show the presence of both rhodium dicarbonyl species simultaneously which suggests that the new species is not a shifted form of the lower frequency species, but rather a new entity. It is also observed that the new species is much less stable in a reducing atmosphere than the lower frequency species. It is therefore proposed that the new dicarbonyl species contains a more oxidized form of rhodium than the traditional Rh/sup +/ dicarbonyl species and that the addition of molybdenum promotes this increased oxidation of the Rh surface sites.
- Research Organization:
- Brigham Young Univ., Provo, UT (USA)
- OSTI ID:
- 6862055
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:9; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
330701 -- Emission Control-- Nitrogen Oxides
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONYLS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
DATA
EXPERIMENTAL DATA
INFORMATION
INFRARED SPECTRA
MINERALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
RHODIUM COMPOUNDS
RHODIUM OXIDES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
VALENCE
330701 -- Emission Control-- Nitrogen Oxides
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONYLS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
DATA
EXPERIMENTAL DATA
INFORMATION
INFRARED SPECTRA
MINERALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
RHODIUM COMPOUNDS
RHODIUM OXIDES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
VALENCE