Acta Phys. -Chim. Sin. ›› 1993, Vol. 9 ›› Issue (01): 63-69.doi: 10.3866/PKU.WHXB19930111

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Characterization of Promotions of Cobalt and Ruthenium in Sulfided Catalysis for Hydrodesulfurization

Li Xin-Sheng; Hou Zhen-Shan; Xin Qin; Guo Xie-Xian   

  1. Dalian Institute of Chemical Physica, Chinese Academy of Sciences, Dalian 116023
  • Received:1991-09-30 Revised:1992-06-10 Published:1993-02-15
  • Contact: Xin Qin

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Abstract: Temperature programmed reduction and volumetric chemisorption of O_2, H_2 and CO have been used to provide insight into the functions of cobalt and ruthenium in a series of sulfided Co-Mo/Al_2O_3, Ru-Mo/Al_2O_3, Ru-Co-Mo/Al_2O_3 catalysts. Cobalt interacted with molybdenum to form a stable species, i.e. CoMoS phase, which decreased the amount of oxygen chemisorption and increased uptake of CO on the Co-Mo/Al_2O_3 catalyst. Ru promotion is found to cause reduction temperature of Mo sites shifting to lower temperature and increase obviousely the amounts of O_2 and H_2 adsorbed on Mo sites. The function of ruthenium is explained by a concept of hydrogen spillover from Ru centers to Mo sites.

Key words: Ru-Co-Mo/Al2O3, Sulfided catalysts, Temperature programmed reduction, Volumetric chemisorption