Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (05): 1063-1072.doi: 10.3866/PKU.WHXB201303072

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Effect of Alcohol Addition on Fischer-Tropsch Synthesis over Cobalt-Based Catalysts

YAO Fang-Fang1,2,3, WU Bao-Shan1,3,4, ZHOU Li-Ping3,4, GAO Jun-Hu3,4, LI Ying3,4, LI Yong-Wang1,3,4   

  1. 1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan 030001, P. R. China;
    2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
    3 National Engineering Laboratory for Coal Indirect Liquefaction, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan 030001, P. R. China;
    4 Synfuels China Co. Ltd., Taiyuan 030001, P. R. China
  • Received:2013-01-21 Revised:2013-03-06 Published:2013-04-24
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2011CB201401) and Intellectual Innovation Project of Chinese Academy of Sciences (KJCX2-YW-N41).

Abstract:

CnH2n+1OH (n=2, 3, 5, 6) primary alcohol activation, hydrogenation and its additional effects on the performance of the Fischer-Tropsch (FT) synthesis over a cobalt catalyst were investigated in a fixed bed micro-reactor. All products were analyzed using an on-line gas chromatography. The diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to investigate intermediates on the catalyst surface. In the presence of argon or hydrogen, CnH2n+1OH underwent two main reactions: direct de-carbonylation to produce (CH2)n-1 hydrocarbons, and dehydration to produce (CH2)n hydrocarbons. The addition of lower carbon number alcohol (ethanol or 1-propanol) into the FT synthesis reaction had no significant effect on the hydrocarbon product distribution. While co-feeding higher carbon number alcohol (1-pentanol or 1-hexanol) into the FT synthesis reaction, the selectivity to hydrocarbons with carbon numbers greater than or equal to n-1 increased markedly because of the additive?s chain initiation on the catalyst surface.

Key words: Cobalt-based catalyst, Fischer-Tropsch synthesis, On-line analysis of all products, C2-C6 primary alcohols, Co-feeding experiment, Reaction mechanism

MSC2000: 

  • O643