氮化物对多孔ZSM-5沸石和Al2O3负载NiMo催化剂加氢脱硫性能的影响

分别以多级孔ZSM-5沸石(ZSM-5-H)和γ-Al₂O₃为载体，制备了NiMoS/ZSM-5-H和NiMoS/γ-Al₂O₃催化剂，采用X射线衍射(XRD)、N₂吸附-脱附、氨气程序升温脱附(NH₃-TPD)等分析方法对催化剂的结构和性质进行了表征，考察了碱性氮化物喹啉和非碱性氮化物吲哚对4,6-二甲基二苯并噻吩(4,6-DMDBT)和二苯并噻吩(DBT)在2种催化剂上加氢脱硫性能的影响。结果表明：与ZSM-5相比，γ-Al₂O₃具有更大的介孔体积和更强的表面酸性。在不存在含氮化合物的情况下，NiMoS/ZSM-5-H催化剂对4,6-DMDBT加氢脱硫性能高于NiMoS/γ-Al₂O₃催化剂；含氮化合物的加入导致NiMoS/ZSM-5-H催化剂对4,6-DMDBT的加氢脱硫活性低于NiMoS/γ-Al₂O₃催化剂，主要原因是含氮化合物强烈地抑制了4,6-DMDBT的转化，但对DBT的加氢脱硫几乎无影响。

Effects of Nitrogen Compounds on Hydrodesulfurization Performance of NiMo Catalysts Supported on Hierarchical PoreZSM-5 Zeolite orAl2O3

Hierarchical pore ZSM-5 zeolite (ZSM-5-H) andγ-Al₂O₃ supported NiMo catalysts (NiMoS/ZSM-5-H and NiMoS/γ-Al₂O₃)were prepared and catalytically evaluated by the hydrodesulfurization (HDS) ofdibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene(4,6-DMDBT) in the absence and presence of nitrogen compounds (quinolone andindole). The supports and catalysts were characterized by X-ray diffraction(XRD), N₂ adsorption-desorption and ammonia temperature-programmeddesorption (NH₃-TPD). The HDS results show that the HDS activity ofNiMoS/ZSM-5-H catalyst is higher than that of NiMoS/γ-Al₂O₃ in the absence of nitrogen compound, althoughγ-Al₂O₃ has larger mesopore volume and stronger surface acidity than those of ZSM-5-H.In contrast, the HDS activity of NiMoS/ZSM-5-H catalyst is lower than that ofNiMoS/γ-Al₂O₃ catalyst in the presence of nitrogen compound. In addition, the conversion of 4,6-DMDBT is reducing rapidly whenadding nitrogen compounds, while the nitrogen compounds hardly have effect onthe HDS of DBT.