Acta Phys. -Chim. Sin. ›› 1991, Vol. 7 ›› Issue (06): 673-680.doi: 10.3866/PKU.WHXB19910608

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Study on Promotion of Cobalt and Ruthenium in Reduced Catalysts for Hydrodesulfurization by IR-Spectroscopy and Chemisorption

Li Xin-Sheng; Hou Zhen-Shan; Wei Zhao-Bin; Xin Qin   

  1. Dalian Institute of Chemical Physics,Chinese Academy of Sciences, National Laboratory for Catalysis, Dalian 116023
  • Received:1990-06-21 Revised:1991-03-01 Published:1991-12-15
  • Contact: Xin Qin

Abstract: IR-spectroscopy and chemisorption in accompanying with CO, NO, H_2, O_2 as probe molecules have been used to elucidate the function of cobalt and ruthenium in the reduced Co-Mo/Al_2O_3, Ru-Mo/Al_2O_3, Ru-Co-Mo/Al_2O_3 catalysts. It is found, the location of cobalt has a partial block effect on Mo sites in its low oxidation state for adsorbing CO, NO, H_2, O_2 probes on reduced Co-Mo/Al_2O_3 catalysts, the intensities of CO and NO bands on Co sites are increased and the NO bands are shifted to the higher freqency side by about 20 cm~(-1) in comparing with that on Co/Al_2O_3 catalysts. In contrast to cobalt, uptake of CO, NO, H_2, O_2 probes are increased evidently on the Mo sitesin the coordination unsaturated state with the addition of ruthenium in the Ru-Mo/Al_2O_3 and Ru-Co-Mo/Al_2O_3 catalysts. It is suggested that ruthenium can promote the dissociation of hydrogen and the spilling of active hydrogen over Mo sites, which will be beneficial to the formation of more coordination unsaturated Mo sites.

Key words: IR spectroscopy, Chemisorption, Hydrodesulfurization, Catalyst