Effect of pore structure on the activity and stability of sulfide phase in hydrodesulfurization (HDS) of diesel were systematically investigated. A series of alumina with different pore structure were prepared by calcining pseudo boehmite at different temperatures. Various characterizations suggested that the surface concentration of OH groups and Lewis acid sites generally decreased with calcination temperature. The properties of sulfide phase in fresh and spent catalysts were analysis by X-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscopy (HRTEM). The results showed that the concentration of CoMoS species was greatly decreased after the reaction while the average length of MoS₂ slabs was substantially increased. The concentration of preserved CoMoS species was proportional to the average pore size of support indicating that the strip-off of Co from CoMoS phase can be reduced when the average pore size is larger. Furthermore, the activity evaluation showed that larger pore structure of support is beneficial for the intrinsic activity and stability of CoMoS phase in the HDS of diesel. The reason was partially attributed to that the pore with larger diameter can reduce the coke deposition on the catalyst so that increase the intrinsic activity and stability of CoMoS sites.

系统研究了孔结构对柴油加氢脱硫(HDS)中硫化物相活性和稳定性的影响。通过在不同温度下煅烧拟勃姆石制备了一系列具有不同孔结构的氧化铝。各种表征表明，OH 基团和路易斯酸位点的表面浓度通常随煅烧温度而降低。通过 X 射线光电子能谱 (XPS) 和高分辨率透射电子显微镜 (HRTEM) 分析新鲜和废催化剂中硫化物相的性质。结果表明，反应后 CoMoS 物种的浓度大大降低，而 MoS ₂的平均长度板块大幅增加。保存的 CoMoS 物种的浓度与载体的平均孔径成正比，表明当平均孔径较大时，可以减少 Co 从 CoMoS 相中的剥离。此外，活性评估表明，载体的较大孔结构有利于柴油 HDS 中 CoMoS 相的固有活性和稳定性。部分原因是直径较大的孔可以减少催化剂上的焦炭沉积，从而提高 CoMoS 位点的内在活性和稳定性。