Use of carbon monoxide and third-derivative EPR spectra to probe the coordination of surface V/sup 4 +/ ions on reduced V/sub 2/O/sub 5//SiO/sub 2/ catalysts
Journal Article
·
· J. Phys. Chem.; (United States)
The coordination properties of surface V/sup 4 +/ ions of reduced V/sub 2/O/sub 5/ supported on silica have been studied by EPR using the adsorption of various probe molecules. The spectrum resolution, greatly enhanced with the third-derivative presentation, indicates an orthorhombic symmetry for the V/sup 4 +/ ions after CO adsorption (g/sub 1/ approx. g/sub 2/ = 1.985, g/sub 3/ = 1.931, A/sub 1/ approx. A/sub 2/ 71.4 G, A/sub 3/ = 191.4 G). The use of /sup 13/C-enriched carbon monoxide allows us to observe that the V/sup 4 +/ surface ions can coordinate two CO molecules from the gas phase to form, together with four lattice oxide ions, a distorted octahedron with one pronounced vanadyl character bond. The /sup 13/C superhyperfine coupling constant is found to be about 7 G. The influence of the adsorbed molecules (CO, H/sub 2/O, C/sub 2/H/sub 4/) on the properties of the V/sup 4 +/ ions at the surface is further discussed. 33 references, 4 figures, 1 table.
- Research Organization:
- Universite P. et M. Curie 4, Paris Cedex, France
- OSTI ID:
- 6038455
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:4; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Dynamical change in the crystal field around the V(IV) ion on TiO/sub 2/ (rutile) surface accompanied by the interaction with adsorbed oxygen molecules
Journal Article
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Sun Sep 01 00:00:00 EDT 1991
· Journal of Catalysis; (United States)
·
OSTI ID:5544744
EPR investigation of the coordination sphere of Mo/sup 5 +/ ions on thermally reduced silica-supported molybdenum catalysts prepared by the grafting method
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Thu May 21 00:00:00 EDT 1987
· J. Phys. Chem.; (United States)
·
OSTI ID:6367979
Dynamical change in the crystal field around the V(IV) ion on TiO/sub 2/ (rutile) surface accompanied by the interaction with adsorbed oxygen molecules
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Thu Oct 23 00:00:00 EDT 1986
· J. Phys. Chem.; (United States)
·
OSTI ID:7225116
Related Subjects
090210 -- Alcohol Fuels-- Properties-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKENES
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
COORDINATION NUMBER
COORDINATION VALENCES
DATA
ELECTRON SPIN RESONANCE
ETHYLENE
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGEN COMPOUNDS
HYPERFINE STRUCTURE
INFORMATION
IONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RESONANCE
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
STABLE ISOTOPES
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VALENCE
VANADIUM COMPOUNDS
VANADIUM OXIDES
WATER
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKENES
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
COORDINATION NUMBER
COORDINATION VALENCES
DATA
ELECTRON SPIN RESONANCE
ETHYLENE
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGEN COMPOUNDS
HYPERFINE STRUCTURE
INFORMATION
IONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RESONANCE
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
STABLE ISOTOPES
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VALENCE
VANADIUM COMPOUNDS
VANADIUM OXIDES
WATER