Hydrodesulfurization NiMo Catalysts Supported on Co, Ni and B Modified Al2O3 from Anderson Heteropolymolybdates

0383060 - ÚCHP 2013 RIV NL eng J - Journal Article
Kaluža, Luděk - Palcheva, R. - Spojakina, A. - Jirátová, Květa - Tyuliev, G.
Hydrodesulfurization NiMo Catalysts Supported on Co, Ni and B Modified Al2O3 from Anderson Heteropolymolybdates.
Procedia Engineering. Roč. 42, SI (2012), s. 873-884. E-ISSN 1877-7058.
[International Congress of Chemical and Process Engineering CHISA 2012 and 15th Conference PRES 2012 /20./. Prague, 25.08.2012-29.08.2012]
R&D Projects: GA ČR GAP106/11/0902
Institutional support: RVO:67985858
Keywords : NiMo/γ-Al2O3 * anderson heteropolymolybdate * additives
Subject RIV: CF - Physical ; Theoretical Chemistry

Recent catalysts of hydrodesulfurization (HDS) reaction consist of CoMo and NiMo phase supported on gamma-Al2O3 support. The support was modified with cobalt nitrate, nickel nitrate, or boric acid and high loadings of Anderson type heteropolyoxomolybdate (NH4)3[Ni(OH)6Mo6O18].7H2O were deposited. Surface area (SBET) and sulfide phase dispersion of the catalysts were determined by N2 physisorption and O2 chemisorption, respectively. Samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, infrared and UV-Vis spectrometry, and temperature programmed reduction. The activity of catalyst was measured in HDS of 1-benzothiophene. The preliminary incorporation of Co, Ni and B into the support increased the HDS activity of the deposited NiMo phase. IR and UV-Vis DR data revealed the partial decomposition of the initial Anderson type NiMo complex with a formation of new surface compounds, including heteropolymolybdates and separated polymeric oxomolybdenum compounds. X-ray photoelectron spectroscopy showed that the degree of Mo sulfidation is the smallest for the catalysts prepared over unmodified alumina and boron-modified alumina. The highest degree of sulfidation was found for the catalysts supported over Co-and Ni-modified alumina. The nickel-modified alumina increased the HDS activity and dispersion of the NiMo phase the most, which was associated with the formation of the largest number of active sites.
Permanent Link: http://hdl.handle.net/11104/0216323