Abstract: Ni-Mo/Al2O3 catalyst for catalytic diesel oil hydrotreating was prepared by incipient wetness impregnation method. The modified Ni-Mo/Al2O3 catalyst by nitrilotriacetic acid (NTA) during impregnation to research the effect of complex agent NTA on hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) activity. The reaction activity was evaluated on a 100mL high-pressure hydrogenation fixed-bed reactor, and the physical and chemical properties were investigated by NH3-TPD, H2-TPR, BET and HRTEM. The results indicated that, catalyst Ni-Mo-NTA/Al2O3 has higher HDS and HDN activity than Ni-Mo/Al2O3. This result was due to that, modifying by NTA improved the surface acidity of the catalyst, reduced the interaction force between metal and supports, improved the reducibility of metal, and the pore structure was optimized, the MoS2 stack layer number distributed at 2~3, and the length of MoS2 lamella distributed at 2-4 nm, the dispersion of activity phase was promoted.

Key words: LCO, HDS, HDN, catalyst, nitrilotriacetic acid