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Effect of cobalt loading on reducibility, dispersion and crystallite size of Co/Al2O3 fischer-tropsch catalyst

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Abstract

Co/Al2O3 Fischer-Tropsch synthesis catalysts with different cobalt loadings were prepared using incipient wetness impregnation method. The effects of cobalt loading on the properties of catalysts were studied by means of X-ray diffraction (XRD), temperature programmed reduction (TPR), hydrogen temperature programmed desorption (H2-TPD) and O2 titration. Co-support compound formation can be detected in catalyst system by XRD. For the Co/Al2O3 catalysts with low cobalt loading, CoAl2O4 phase appears visibly. Two different reduction regions can be presented for Co/Al2O3 catalysts, which belong to Co3O4 crystallites (reduction at 320°C) and cobalt oxidetallite size. The reduced Co/Al2O3 catalysts have two adsorption sites, and cobalt loading greatly influences the adsorption behavior. With the increase of cobalt loading, the amount of low temperature adsorption is increased, the amount of high temperature adsorption is decreased, and the percentage reduction and cobalt crystallite size are increased.

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Authors and Affiliations

  1. School of Chemistry and Life Science, South Central University for Nationalities, 430074, Wuhan, China

    Xiong Hai-feng, Zhang Yu-hua & Li Jin-lin PhD (Professor)

  2. School of Chemistry and Chemical Engineering, Central South University, 410083, Changsha, China

    Gu Ying-ying

Authors
  1. Xiong Hai-feng
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  2. Zhang Yu-hua
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  3. Li Jin-lin PhD
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  4. Gu Ying-ying
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Correspondence to Li Jin-lin PhD.

Additional information

Foundation item: Project (20373090) supported by the National Natural Science Foundation of China: project (2003 ABB013) supported by the Talented Young Scientist Foundation of Hubei Province; project supported by the Excellent Young Teachers Program of Ministry of Education of China; project supported by the State Ethnic Affairs Commission of China; project supported by the Returnee Startup Scientific Research Foundation of Ministry of Education of China

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Xiong, Hf., Zhang, Yh., Li, Jl. et al. Effect of cobalt loading on reducibility, dispersion and crystallite size of Co/Al2O3 fischer-tropsch catalyst. J Cent. South Univ. Technol. 11, 414–418 (2004). https://doi.org/10.1007/s11771-004-0086-2

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  • DOI: https://doi.org/10.1007/s11771-004-0086-2

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