Abstract: Using five kinds of sulfides with different structures as sulfurization agents, the oil-soluble organic molybdenum catalyst MACC as the research object, the effects of the sulfurization agent structure on the active center structure, morphology, distribution and particle size of the catalyst were investigated. The results showed that it was difficult for both dibenzothiophene and dimethyl sulfide to react with the catalyst to form active sites under the experimental conditions, and dodecylmercaptan, dimethyl disulfide (DMDS) and sublimated sulfur could reacted with the catalyst to form active centers. Furthermore, the active phase MoS₂ formed with dodecylmercaptan as the sulfurization agent had a fewer stripes and higher dispersion than other two samples, while the samples sulfided by DMDS and sublimated sulfur had higher degree of sulfurization (~90%). The results of the simulated sulfurization reactions of catalyst MACC under the condition of mixed feed tank indicated that the sulfurization of dibenzothiophene could not be achieved, but the sulfurization of sublimated sulfur could be achieved to a high degree.

Key words: sulfurization agent, oil soluble Mo based catalyst, sulfurization degree