Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (10): 901-906.doi: 10.3866/PKU.WHXB20021007

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Catalytic Reduction of SO2 by CO on Sulfided CoMo/ Al2O3-TiO2 Catalysts

Zhang Wen-Hua;Peng Jiang-Jie;Ma Yun-Sheng;Hao Li-Qing;Zhuang Shu-Xian   

  1. Chemical Physics Department, University of Science and Technology of China, Hefei　230026
  • Received:2002-01-18 Revised:2002-04-08 Published:2002-10-15
  • Contact: Zhuang Shu-Xian E-mail:szhuang@ustc.edu.cn

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Abstract: The catalytic reduction of SO2 by CO has been systematically investigated over the sulfided CoMo catalysts (4.0％CoO, 15.0％MoO3) supported on Al2O3, Al2O3-TiO2 and TiO2.The results show that CO and SO2 could be converted completely to CO2 and elemental sulfur at 350 ℃, 350～400 ℃ and 400 ℃ respectively on those catalysts mentioned above. Interestingly, two kind of mechanism, namely COS as intermediate and modified Redox mechanism, were found to perform simultaneously over the catalysts supported on TiO2 or Al2O3-TiO2 above 200 ℃,which greatly suppressed the COS production and resulted in a higher sulfur selectivity than that on the Al2O3-supported catalyst. The reaction mechanism was also discussed.

Key words: CO-SO2 reaction, Sulfided catalysts, Cobalt molybdenum catalyst, Al2O3-TiO2 mixing support, 　Synergistic effect