Abstract
NiMo/Al2O3 catalysts prepared by impregnation and coprecipitation methods have been compared in catalytic activity for the hydrodesulfurization of dibenzothiophene (DBT) and have been characterized by X-ray diffraction (XRD), Brunauer−Emmett−Teller (BET), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) techniques. The combined results of XRD and XPS indicate that the coprecipitation catalysts contained active β-NiMoO4 phase while NiAl2O4 and the mixing oxidation state of Mo6+ and Mo5+ species were observed on the impregnation catalyst. The formation of β-NiMoO4 precursor in the unsulfided NiMo/Al2O3 catalyst prepared by coprecipitation is attributed to the enhanced catalytic activity. BET surface area and N2 adsorption isotherm measurement demonstrate the characteristic of mesopores for the impregnation catalyst and of macropores for the coprecipitation catalyst. SEM images show that the impregnation method partially caused aggregated crystals while coprecipitation produced ...
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