Spectroscopic characterization of TiO/sub 2//Al/sub 2/O/sub 3/ and Co/Al/sub 2/O/sub 3/-TiO/sub 2/ catalysts
Journal Article
·
· J. Catal.; (United States)
OSTI ID:5182456
X-ray photoelectron spectroscopy (ESCA or XPS), laser Raman spectroscopy (LRS), and X-ray diffraction (XRD) have been used to characterize the dispersion and chemical state of a series of TiO/sub 2//Al/sub 2/O/sub 3/ carriers and a series of 3% Co/Al/sub 2/O/sub 3/-TiO/sub 2/ catalysts. It was found that titania is well dispersed on alumina for Ti loadings less than 14 wt%. The formation of a TiO/sub 2/:Al/sub 2/O/sub 3/ surface phase occurred for carriers in the 1 to 6 wt% Ti range. Formation of anatase occurred, in addition to the TiO/sub 2/:Al/sub 2/O/sub 3/ surface phase, at loadings in excess of 6 wt% Ti, with the amount of anatase increasing with increasing titania loading. ESCA data indicate that the dispersion of cobalt supported on the titania-modified alumina carriers increased with increasing titania loading. XRD and LRS results show that the increase in dispersion can, in part, be ascribed to the formation of a surface cobalt phase at the detriment of the Co/sub 3/O/sub 4/ phase. 29 references.
- Research Organization:
- Univ. of Pittsburgh, PA (USA)
- DOE Contract Number:
- AC02-79ER10485
- OSTI ID:
- 5182456
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 106:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL PROPERTIES
COBALT
COHERENT SCATTERING
DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
LASER SPECTROSCOPY
LOADING RATE
METALS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHOTOELECTRON SPECTROSCOPY
RAMAN SPECTROSCOPY
SCATTERING
SPECTROSCOPY
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL PROPERTIES
COBALT
COHERENT SCATTERING
DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
LASER SPECTROSCOPY
LOADING RATE
METALS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHOTOELECTRON SPECTROSCOPY
RAMAN SPECTROSCOPY
SCATTERING
SPECTROSCOPY
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY