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Surface spectroscopic characterization of hydrodesulfurization catalysts, molybdenum-alumina catalysts, and Ni-W/Al/sub 2/O/sub 3/ catalysts, and molybdenum-titania catalysts

Thesis/Dissertation ·
OSTI ID:6444467

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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