Hydrodesulfurization activities of NiMo catalysts supported on mechanochemically prepared Al-Ce mixed oxides

doi:10.1016/S1872-2067(15)61016-6

Abstract

Abstract:

Al₂O₃-CeO₂ supports containing 1-10 wt% Ce were prepared mechanochemically by milling aluminum and/or cerium nitrates with NH₄HCO₃. Heteropolymolybdate, (NH₄)₄NiMo₆O₂₄, was used as the precursor of the Ni and Mo to prepare NiMo₆/Al₂O₃-CeO₂ components in catalysts by impregnation method. The physicochemical properties of the catalysts were determined using chemical analysis, X-ray diffraction, temperature-programmed H₂ reduction, temperature-programmed NH₃ desorption, X-ray photoelectron spectroscopy (XPS), and the Brunauer-Emmett-Teller method. The catalyst acidity decreased with increasing Ce concentration in the support. XPS showed that the NiS/MoS ratio decreased two-fold for the Ce-modified alumina support. NiMo₆/Al₂O₃, which had the highest acidity, showed the highest activity in hydrodesulfurization of 1-benzothiophene (normalized per weight of catalyst). The concentration of surface MoO_xS_y species (which is equal to the concentration of Mo⁵⁺) gradually decreased to zero for catalysts with Ce concentrations ≥ 10 wt%. However, the activities of all the catalysts prepared mechanochemically from Al₂O₃ and Al₂O₃-CeO₂ supports significantly exceeded that of a reference NiMo₆/Al₂O₃ catalyst prepared by impregnation method using the same precursor and with the same composition.

Key words: Nickel, Molybdenum, Alumina, Ceria, Anderson heteropolymolybdate, 1-Benzothiophene, Hydrodesulfurization, Mechanochemical method

Květa Jirátová, Alla Spojakina, Luděk Kaluža, Radostina Palcheva, Jana Balabánová, Georgi Tyuliev. Hydrodesulfurization activities of NiMo catalysts supported on mechanochemically prepared Al-Ce mixed oxides[J]. Chinese Journal of Catalysis, 2016, 37(2): 258-267.

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