Surface spectroscopic characterization of hydrodesulfurization catalysts, molybdenum-alumina catalysts, and Ni-W/Al/sub 2/O/sub 3/ catalysts, and molybdenum-titania catalysts
X-ray photoelectron spectroscopy (ESCA), ion scattering spectroscopy (ISS), and x-ray diffraction have been used to characterize a series of sulfided and reduced MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/ catalysts. ESCA and ISS have identified the presence of both MoS/sub 2/ and Mo(V) on a sulfided MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/ catalyst. The octahedrally and tetrahedrally coordinated molybdenum on an oxidic MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/ precursor catalyst show different sulfidation behavior. The distribution of nickel species on Ni/Al/sub 2/O/sub 3/ and Ni-W/Al/sub 2/O/sub 3/ catalysts have been studied using ESCA and ISS. Increases in the peak width asymmetry of an Ni 2p photoelectron spectra were observed for Ni/Al/sub 2/O/sub 3/ when the nickel content was increased. These changes were minimized when the tungsten concentration was increased from 15 to 24% WO/sub 3/. The surface structure of MoO/sub 3//TiO/sub 2/ catalysts have been investigated using several spectroscopic techniques: ESCA, ISS, x-ray diffraction, IR and Raman spectroscopy. Up to the concentration of 10wt% MoO/sub 3/, two types of molybdenum-titania surface interaction species are produced in roughly a 2:1 proportion.
- Research Organization:
- Pittsburgh Univ., PA (USA)
- OSTI ID:
- 6444467
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DESULFURIZATION
DIFFRACTION
DIFFUSION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
INFRARED SPECTRA
ION SCATTERING ANALYSIS
IONIZING RADIATIONS
LASER SPECTROSCOPY
METALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NICKEL
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
RAMAN SPECTROSCOPY
REDUCTION
REFRACTORY METAL COMPOUNDS
SCATTERING
SPECTRA
SPECTROSCOPY
SULFIDATION
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN
X RADIATION
X-RAY DIFFRACTION