Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (6): 952-961.DOI: 10.1016/S1872-2067(11)60376-8

• Research papers • Previous Articles     Next Articles

NiMo/γ-Al2O3 Catalysts from Ni Heteropolyoxomolybdate and Effect of Alumina Modification by B, Co, or Ni

Radostina PALCHEVA1, Luděk KALU?A2,*, Alla SPOJAKINA1, Květuše JIRÁTOVÁ2, Georgi TYULIEV1   

  1. 1Institute of Catalysis, Bulgarian Academy of Sciences, G. Bonchev str., bldg. 11, 1113 Sofia, Bulgaria; 2Institute of Chemical Process Fundamentals of the Academy of Sciences of the Czech Republic, v.v.i., 165 02 Prague 6, Czech Republic
  • Received:2011-12-16 Revised:2012-02-06 Online:2012-05-30 Published:2012-05-30

Abstract: A hydrotreating NiMo/γ-Al2O3 catalyst (12 wt% Mo and 1.1 wt% Ni) was prepared by impregnation of the support with the Anderson-type heteropolyoxomolybdate (NH4)4Ni(OH)6Mo6O18. Before impregnation of the support, it was modified with an aqueous solution of H3BO3, Co(NO3)2, or Ni(NO3)2. The catalysts were investigated using N2 adsorption, O2 chemisorption, X-ray diffraction, UV-Vis spectroscopy, Fourier transform infrared spectroscopy, temperature-programmed reduction, temperature-programmed desorption, and X-ray photoelectron spectroscopy. The addition of Co, Ni, or B influenced the Al2O3 phase composition and gave increased catalytic activity for 1-benzothiophene hydrodesulfurization (HDS). X-ray photoelectron spectroscopy confirmed that the prior loading of Ni, Co or B increased the degree of sulfidation of the NiMo/γ-Al2O3 catalysts. The highest HDS activity was observed with the NiMo/γ-Al2O3 catalyst with prior loaded Ni.

Key words: nickel, cobalt, boron, nickel heteropolyoxomolybdate, hydrodesulfurization