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Preparation of hydrodesulfurization catalysts using MoS3 nanoparticles as a precursor
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2017-10-18 , DOI: 10.1016/j.apcatb.2017.10.046
Yang Gao , Wei Han , Xiangyun Long , Hong Nie , Dadong Li

γ-Alumina-supported MoS3 nanoparticles (NPS) denoted as MoS3/Al2O3 were firstly synthesized by chemical deposition method, and then used as the “second support” for promoter Ni atoms to prepare a pre-sulfided bimetallic HDS catalyst denoted as CAT-MoS3 by the conventional impregnation method. Meanwhile, for comparison purpose, two bimetallic catalysts denoted as CAT-MoS2 and CAT-MoO3 with the same metal loadings were prepared using MoS2/Al2O3 and MoO3/Al2O3 as the starting material, respectively. Characterization and activity assessment show that, using MoS3 as the precursor not only promotes the resulting bimetallic catalyst with a much higher sulfidation degree of Mo species, but also realizes a better decoration of Ni atoms onto the edges of MoS2 nanoslabs. The dual effect guarantees the plentiful formation of Type II Ni-Mo-S active sites and thus remarkably enhances the hydrodesulfurization (HDS) activity. Compared with CAT-MoS2, CAT-MoS3 possesses very similar physical properties, microstructure and sulfidation degree of Mo species, however, due to its much higher decoration degree of Ni atoms, it holds a significantly enhanced HDS activity. Moreover, in comparison with CAT-MoS2, CAT-MoO3 exhibits a worse microstructure (more MoS2 nanoslabs with larger length and lower stacking) and a much lower sulfidation degree of Mo species, but it still holds much higher HDS activity, further implying that the decoration degree (i.e. promoting effect) imposes the most important impact on the HDS activity. It is rational and effective to modify the starting state of Mo species to enhance the promoting effect and thereof improve the catalytic performance.



中文翻译:

以MoS 3纳米粒子为前驱体制备加氢脱硫催化剂

γ γ-氧化铝担载的MoS 3个纳米颗粒(NP小号)表示为的MoS 3 / Al的2 ö 3通过化学沉积法首次合成,然后用作“第二支持”启动子Ni原子以制备预硫化双金属HDS通过常规的浸渍方法将催化剂称为CAT-MoS 3。同时,为了比较目的,2个的双金属催化剂称为CAT-MOS 2和CAT-的MoO 3具有相同的金属载量为利用MOS制备2 / Al的2 ö 3和的MoO 3 / Al的2 ö 3分别作为起始原料。表征和活性评估表明,以MoS 3为前驱体不仅可以促进生成的双金属催化剂具有更高的Mo物种硫化度,而且可以在MoS 2纳米片的边缘实现更好的Ni原子修饰。双重作用确保了II型Ni-Mo-S活性位点的大量形成,因此显着增强了加氢脱硫(HDS)活性。与CAT-MoS 2相比,CAT-MoS 3具有非常相似的物理性质,Mo物种的微观结构和硫化度,但是由于其Ni原子的修饰度高得多,因此具有显着增强的HDS活性。此外,与CAT-MoS相比从图2可以看出,CAT-MoO 3的显微组织较差(更多的MoS 2纳米片具有更大的长度和较低的堆积度),并且Mo物种的硫化度更低,但仍具有更高的HDS活性,进一步暗示了装饰度(即促进效果)对HDS活动产生了最重要的影响。改变Mo物种的起始状态以增强其促进作用并改善其催化性能是合理而有效的。

更新日期:2017-10-18
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