Relation between the morphology of MoS2 in NiMo catalyst and its selectivity for dibenzothiophene hydrodesulfurization
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摘要: 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。Abstract: Two series of NiMo catalysts supported on alumina with different loadings of molybdenum and nickel were prepared and characterized by X-ray diffraction, N2 sorption, and high-resolution transmission electron microscopy. The performance of NiMo catalysts for hydrodesulfurization was evaluated in a fixed-bed microreactor using dibenzothiophene as a model compound. The effect of morphology of MoS2 phase in NiMo catalyst on its hydrogenation selectivity was investigated. The results indicated that the morphology of MoS2 phases is affected by the loadings of molybdenum and nickel. Mo18Ni4 catalyst (containing 18% MoO3 and 4% NiO), which is provided with the well-known MoS2 slab structures with a multilayered morphology, exhibits high hydrodesulfurization activity and hydrogenation selectivity. The hydrogenation selectivity of NiMo catalyst is linearly correlated with the stacking number of MoS2 slab; the higher the stacking number, the better is the hydrodesulfurization selectivity.-
Key words:
- NiMo catalyst /
- hydrodesulfurization /
- MoS2 morphology /
- hydrogenation selectivity /
- dibenzothiophene /
- stacking number
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