柠檬酸对焦化粗苯加氢Co-Mo催化剂性能和结构的影响

oking benzol hydrodesulfurization catalysts were prepared by the isovolumic impregnation method using cobalt and molybdenum as active metals. The properties of the catalyst modified by citric acid in the impregnation solution and the catalytic performance and the structure of hydrodesulfurization were examined. The physical and chemical properties of the catalysts were investigated with BET , XRD a nd TG-DSC，it was revealed that the BET surface area and pore volume of Co-Mo catalyst were increased by adding CA in the impregnation solution,and also more pores were made.The interaction between Co and carrier was reduced when Co2+ chelated with CA. The increase of concentration CA leaded to the Mo sulfide phase tended to form Mo3S4 phase, Co sulfide phase tended to form CoS phase. The sulfuration of Co phase was delayed by Adding CA,leading to cover the sides and edges of MoS2 phase, and formed more active centers.