Catalysis Letters

, Volume 114, Issue 3–4, pp 161–168 | Cite as

Effect of manganese on a potassium-promoted iron-based Fischer-Tropsch synthesis catalyst

  • Zhichao Tao
  • Yong Yang
  • Haijun Wan
  • Tingzhen Li
  • Xia An
  • Hongwei Xiang
  • Yongwang Li


The effects of manganese promoter on the reduction–carburization behavior, surface basicity, bulk phase structure and their correlation with Fischer-Tropsch synthesis (FTS) performances have been emphatically studied over a series of spray-dried Fe–Mn–K catalysts with a wide range of Mn incorporation amount. The catalysts were characterized by means of H2 and CO temperature-programmed reduction (TPR), CO2 temperature-programmed desorption (TPD), Mössbauer spectroscopy etc.. The results indicated that small amount of Mn promoter can promote the reduction of the catalyst in H2. However, FeO phase formed during reduction is stabilized by MnO phase with the further increase of Mn content, making FeO phase difficult to be reduced in H2. The addition of Mn promoter can stabilize the Fe2+ and Fe3+ ions, and suppresses the reduction and carburization of the catalyst in syngas and CO. Mn promoter can also enhance the amount of the basic sites and weaken the strength of the basic sites, which possibly come from the reason that the Mn–K interaction is strengthened with the addition of Mn promoter. The change of surface basicity can modify the selectivity of hydrocarbons and olefins, and the change of bulk structure phase derived from the addition of Mn promoter will affect the catalyst activity and run stability. The synergetic effects of the two main factors result in an optimized amount of Mn promoter for the highest catalyst activity and heavy hydrocarbon selectivity in slurry FTS reaction of Fe–Mn–K catalysts.


Fischer-Tropsch synthesis iron–manganese catalyst manganese promoter 



We gratefully acknowledge the financial support from Key Program of National Natural Science Foundation of China (20590361) and National Natural Science Foundation of Shanxi province (2006021014). This work was performed under the authority of Synfuels China Co., Ltd.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Zhichao Tao
    • 1
    • 2
  • Yong Yang
    • 1
  • Haijun Wan
    • 1
    • 2
  • Tingzhen Li
    • 1
    • 2
  • Xia An
    • 1
    • 2
  • Hongwei Xiang
    • 1
  • Yongwang Li
    • 1
  1. 1.State Key Laboratory of Coal Conversion, Institute of Coal ChemistryChinese Academy of SciencesTaiyuanPeople’s Republic of China
  2. 2.Graduate University of Chinese Academy of SciencesBeijingPeople’s Republic of China

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