针对NiMo系加氢脱硫(HDS)催化剂活性相表面存在的多聚硫物种(Sx)对催化活性有着显著影响的现象，本项目拟采用脉冲反应及多种原位谱学表征技术系统研究NiMo系催化剂表面Sx的动态调变规律及其对HDS活性的影响，研究负载型硫化态催化剂的硫溢流现象及载体的调变作用。在此基础上，建立气相H2/H2S-载体性质-活性相Sx浓度-催化活性四者的定量关系，探明多聚硫物种Sx动态平衡反应的热力学及动力学规律。结合理论计算，提出修正的NiMoS-Sx动态平衡结构模型。本项目研究有助于加深对HDS催化剂活性相本质的理解，且将为油品深度HDS催化剂的研究和开发提供科学依据。

In the recent experiments, we have found that the sulfur polymer (Sx) species on the surface of NiMo hydrodesulfurization (HDS) catalysts has a significant influence on the catalytic activity. Thus, this project is aimed at systematically investigating the effect of the various factors on the concentration of dynamic surface Sx species and the HDS performance by means of the HDS pulse reaction, tracking the changing tendency of the Sx species by means of various in-situ spectroscopy characterization techniques. The dynamic equilibrium of the sulfur polymer (Sx) will be studied quantitatively, and the phenomenon of sulfur spillover will be concerned. On that basis, the relation among gaseous phase H2/H2S-supporter feature-concentration of Sx species-catalytic activity, as well as the thermodynamics and dynamics of the Sx reaction and the structure model of NiMoS-Sx dynamic equilibrium will be established by those characterizations and calculations. That will contribute to improve the understanding of the nature of the active phase on HDS catalysts, and provide a scientific basis for the development of the practical catalysts used in ultradeep HDS process.