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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Preparation of hydrodesulfurization catalysts using MoS3 nanoparticles as a precursor
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Preparation of hydrodesulfurization catalysts using MoS3 nanoparticles as a precursor

机译：使用MOS3纳米颗粒作为前体制备加氢脱硫催化剂的制备

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摘要

gamma-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.
机译：首先通过化学沉积法合成为MOS3 / Al 2 O 3的γ-氧化铝支撑的MOS3纳米颗粒（NPS），然后用作启动子Ni原子的“第二载体”，制备作为Cat-MOS3表示的预硫化双金属HDS催化剂通过传统的浸渍方法。同时，对于比较目的，使用MOS2 / Al 2 O 3和MOO3 / Al2O3作为起始材料，制备两种表示为CAT-MOS2和具有相同金属载荷的CAT-MOO3的双金属催化剂。表征和活性评估表明，使用MOS3作为前体不仅促进所得的二氧化硅催化剂，并且还实现了MO物种的硫化程度更高的硫化程度，而且还实现了更好的Ni原子装饰到MOS2纳米纳米杆的边缘上。双重效果可确保II型Ni-Mo-S活性位点的丰富形成，因此显着增强了加氢脱硫（HDS）活性。与CAT-MOS2相比，CAT-MOS3具有非常相似的物理性质，MO物种的微观结构和硫化程度，然而，由于其更高的Ni原子的装饰程度，它具有显着增强的HDS活性。此外，与CAT-MOS2相比，CAT-MOO3表现出更差的微观结构（更多的MOS2纳米球形，具有较大的长度和更低堆叠），并且仍然更低的MO物种硫化程度，但它仍然具有更高的HDS活性，进一步意味着装饰程度（即促进效果）对HDS活动产生最重要的影响。修饰Mo物种的起始状态是合理的，有效的，以增强促进效果及其改善催化性能。

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