氨基三乙酸对Ni-Mo/Al2O3催化裂化柴油加氢脱硫脱氮活性的影响

以等体积浸渍法制备Ni-Mo/Al2O3催化裂化柴油加氢处理催化剂，在金属浸渍液配置过程中引入一定比例的络合剂氨基三乙酸（NTA）制备改性催化剂Ni-Mo-NTA/Al2O3，通过改性前后催化剂的对比分析研究氨基三乙酸对催化剂加氢脱硫和脱氮活性的影响。采用100 mL高压加氢反应装置对催化剂进行加氢脱硫、脱氮反应活性评价，并以NH3-TPD，H2-TPR，BET，HRTEM 等手段对催化剂进行表征。结果表明，引入氨基三乙酸后催化剂在不同反应温度等级下加氢脱硫和脱氮活性均有提高，这是由于氨基三乙酸改性后催化剂表面酸量提高，载体与金属作用力削弱，金属还原度提高，孔结构得到改善，MoS2金属堆垛层数集中在2~3层，片晶长度集中在2~4 nm，金属分散度提高。

EFFECT OF NTA ON HDS AND HDN ACTIVITY OF Ni-Mo/Al2O3 FOR FCC DIESEL

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.