Unsupported bimetallic sulfide catalysts were obtained in situ using Mo(CO)₆ and Co octoate as precursors to investigate the promotional effect of Co on the MoS₂ catalyst in the hydrocracking (HCK) of vacuum residue (VR). Transmission electron microscopy (TEM) and X-ray absorption fine structure spectroscopy were used to obtain structural properties of the catalysts. The bimetallic CoMoS₂ catalyst exhibited high catalytic activity in the VR HCK with respect to the H₂ consumption rate and asphaltene conversion as compared with monometallic sulfides such as Co₉S₈ or MoS₂ with the same catalyst loading of 0.113 mmol at 673 K and 9.5 MPa H₂. Higher hydrodesulfurization activity was also observed for the CoMoS₂ catalyst. Moreover, extended X-ray absorption fine structure and TEM analysis identified the formation of a Co–Mo–S phase in monoslab particles of average particle size 6.7 nm and the maintenance of the morphology during five times of recycle tests. These results thus suggest that the unsupported CoMoS₂ catalyst has a promotional effect on VR HCK.

以Mo（CO）₆和辛酸钴为前驱物原位获得了无载体的双金属硫化物催化剂，以研究Co对真空渣油（VR）的加氢裂化（HCK）中MoS ₂催化剂的促进作用。使用透射电子显微镜（TEM）和X射线吸收精细结构光谱法获得催化剂的结构性质。与单金属硫化物（例如Co ₉ S ₈或MoS _2）相比，双金属CoMoS ₂催化剂在VR HCK中的H ₂消耗速率和沥青质转化率表现出较高的催化活性，在673 K和0.1 K mmol时催化剂负载相同。 9.5兆帕H ₂。对于CoMoS ₂催化剂，还观察到更高的加氢脱硫活性。此外，扩展的X射线吸收精细结构和TEM分析确定了平均粒径6.7 nm的单块颗粒中Co-Mo-S相的形成，并在五次循环测试中保持了形态。因此，这些结果表明，未负载的CoMoS ₂催化剂对VR HCK具有促进作用。