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制备了两个系列不同镍钼负载量的NiMo催化剂,并用X衍射、N2物理吸附和透射电镜进行了表征。以二苯并噻吩为模型硫化物,在高压固定床微型反应器上对该NiMo催化剂的加氢脱硫性能进行了评价,研究了MoS2形貌与催化剂加氢脱硫选择性之间的关系。结果表明,镍钼负载量对MoS2形貌有明显的影响。Mo18Ni4催化剂(含18%MoO3和4%NiO)上MoS2呈多级层状结构,具有较高的加氢脱硫活性和优异的加氢脱硫选择性。加氢选择性与催化剂上活性组分MoS2的堆积层数相关联呈很好的线性关系;堆积层数越多,其加氢选择性也越高。
Two series of NiMo catalysts with different nickel-molybdenum loadings were prepared and characterized by X-ray diffraction, N2 physical adsorption and transmission electron microscopy. Using dibenzothiophene as the model sulfide, the performance of the NiMo catalyst was evaluated on a high pressure fixed bed microreactor. The relationship between the morphology of MoS2 and the selectivity of hydrodesulfurization was investigated. The results show that the loading of nickel molybdenum has a significant effect on the morphology of MoS2. MoS2 has a multi-layered structure on Mo18Ni4 catalyst (containing 18% MoO3 and 4% NiO) with high hydrodesulfurization activity and excellent hydrodesulfurization selectivity. Hydrogenation selectivity has a good linear relationship with the deposited layer number of active component MoS2 on the catalyst. The more layers are deposited, the higher the hydrogenation selectivity.