Herein, a series of mesoporous NiMo/LaAlO_x with various La contents were constructed through a solvent evaporation-induced self-assembly protocol, and their catalytic activities were investigated for hydrodesulfurization (HDS) of 4,6-DMDBT. It has been confirmed that the incorporation of La influences the electronic structure and morphology of NiMoS active phase. The lower amount of La (x ≤ 1.0 wt.%) could facilitate the formation of “Type II” NiMoS phase by weakening the interaction of Mo-O-Al leakage and promoting the sulfidation of both Mo and Ni species as well as increasing the ratio of “Type II” NiMoS phase, thereafter boosting the HDS performances. Further increasing La incorporation, however, leads to the generation of inactive NiS_x phase and decrease of NiMoS active phase proportion, the HDS activities of corresponding catalysts were suppressed. NiMo/LaAlO_x-1.0 exhibits the highest activity for 4,6-DMDBT HDS because of its moderate metal-support interaction, optimal morphology and the largest proportion of “Type II” NiMoS active phase.

中文翻译：

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La改性调节NiMo/Al2O3活性相结构用于柴油超深度加氢脱硫

在此，通过溶剂蒸发诱导自组装方案构建了一系列具有不同 La 含量的介孔 NiMo/LaAlOx _，并研究了它们对 4,6-DMDBT 加氢脱硫 (HDS) 的催化活性。已经证实，La 的掺入影响 NiMoS 活性相的电子结构和形态。较低量的 La ( x  ≤ 1.0 wt.%) 可以通过削弱 Mo-O-Al 泄漏的相互作用并促进 Mo 和 Ni 物种的硫化以及增加“II 型”NiMoS 相的形成“II 型”NiMoS 相的比例，此后提高了 HDS 性能。然而，进一步增加 La 掺入会导致产生非活性 NiS _x相和 NiMoS 活性相比例的降低，相应催化剂的 HDS 活性受到抑制。NiMo/LaAlO _x -1.0 表现出最高的 4,6-DMDBT HDS 活性，因为它具有适度的金属-载体相互作用、最佳形态和最大比例的“II 型”NiMoS 活性相。