Hydrodesulfurization Activities of NiMo Catalysts Supported on Mechanochemically Prepared Al‐Ce Mixed Oxides.

0455543 - ÚCHP 2017 RIV CN eng J - Journal Article
Jirátová, Květa - Spojakina, A. - Kaluža, Luděk - Palcheva, R. - Balabánová, Jana - Tyuliev, G.
Hydrodesulfurization Activities of NiMo Catalysts Supported on Mechanochemically Prepared Al‐Ce Mixed Oxides.
Chinese Journal of Catalysis. Roč. 37, č. 2 (2016), s. 258-267. ISSN 0253-9837. E-ISSN 1872-2067
R&D Projects: GA ČR GAP106/11/0902
Institutional support: RVO:67985858
Keywords : nickel * molybdenum * alumina
OECD category: Chemical process engineering
Impact factor: 2.813, year: 2016

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 MoOxSy 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.
Permanent Link: http://hdl.handle.net/11104/0256203