Co-Mo sulfide catalysts with different particle size and structures were prepared in ethanol-water mixed solvent followed by a low-temperature sulfurization process, and were tested in dibenzothiophene hydrodesulfurization. The effects of the ethanol/water ratio on the particle size of precursors, active phase composition, active site number, morphology, and hydrodesulfurization activity of the final catalysts were investigated. The atomic ratio of Co/Mo and active phase morphology of catalysts closely relate to the dielectric constant of ethanol-water mixed solvent. Appropriate dielectric constant favors the formation of (Co)MoS₂ slabs with shorter length (∼ 5.0 nm) and higher stacking number (∼ 4.3 layers), resulting in more coordinatively unsaturated sites, especially in the corner sites. The catalytic activity not only depends on the active sites of CoMoS phase, but also on that of Co₉S₈ and MoS₂ phases because of synergistic effect. For MoS₂ and CoMoS phases, the corner sites show higher direct desulfurization activity than the edge sites.

在乙醇-水混合溶剂中制备了具有不同粒径和结构的钴钼硫化物催化剂，然后进行了低温硫化工艺，并在二苯并噻吩加氢脱硫中进行了测试。研究了乙醇/水比例对最终催化剂的前驱体粒径，活性相组成，活性位点数目，形态和加氢脱硫活性的影响。Co / Mo的原子比和催化剂的活性相形态与乙醇-水混合溶剂的介电常数密切相关。适当的介电常数有利于（Co）MoS ₂的形成较短长度（〜5.0 nm）和更高堆积量（〜4.3层）的平板，导致更多的不饱和位点，尤其是在拐角处。催化活性不仅取决于CoMoS相的活性位点，而且由于协同作用还取决于Co ₉ S ₈和MoS ₂相的活性位点。对于MoS ₂和CoMoS相，角位点显示的直接脱硫活性高于边缘位点。