Characterization of SiO/sub 2/-supported Mo(VI): the effect of calcination and exposure to water vapor
Journal Article
·
· J. Phys. Chem.; (United States)
Surface structural speciation of SiO/sub 2/-supported Mo(VI) as a function of Mo impregnation technique, Mo loading, and hydration-calcination cycles is investigated by electron spectroscopy for chemical analysis (ESCA), ion scattering spectrometry (ISS), and laser Raman spectroscopy. More Mo is surface segregated by use of aqueous impregnation techniques than by use of allyl fixation. In both cases, the surface species, which are dependent upon Mo loading, include crystalline MoO/sub 3/, highly dispersed surface molybdate, and silicomolybdic acid. The symmetry within the silicomolybdic acid is destroyed by 500/sup 0/C O/sub 2/ calcination and is subsequently restored by rehydration. Consequences of the presence of such surface species with respect to the photocatalytic conversion of propane are discussed.
- Research Organization:
- Pittsburgh Energy Technology Center, PA
- OSTI ID:
- 5037214
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:20; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CALCINATION
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDRATION
INFORMATION
ION SCATTERING ANALYSIS
LASER SPECTROSCOPY
METALS
MINERALS
MOLYBDENUM
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
RAMAN SPECTROSCOPY
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SOLVATION
SPECTROSCOPY
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
400201* -- Chemical & Physicochemical Properties
CALCINATION
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDRATION
INFORMATION
ION SCATTERING ANALYSIS
LASER SPECTROSCOPY
METALS
MINERALS
MOLYBDENUM
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
RAMAN SPECTROSCOPY
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SOLVATION
SPECTROSCOPY
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS