Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2010, Vol. 31 ›› Issue (12): 1483-1488.DOI: 10.3724/SP.J.1088.2010.00617

• Research papers • Previous Articles     Next Articles

Deactivation of Cobalt-Based Catalysts for Fischer-Tropsch Synthesis

SHI Lihong1,2,*, LI Xiaofeng3, LI Debao2, SUN Yuhan2   

  1. 1School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, Shanxi, China; 2State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China; 3Taiyuan Infant Normal School, Taiyuan 030027, Shanxi, China
  • Received:2010-06-11 Online:2010-12-13 Published:2014-04-26

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Abstract: Stability tests of Co/SiO2, Co/Ru/SiO2, and hydrophobically-organically modified Co/Ru/SiO2 (Co/Ru/SiO2-S) for Fischer- Tropsch synthesis were carried out. As the time on stream went on, CO conversion decreased in all the cases. The growth of cobalt crystallite and the formation of cobalt silicates species were the reasons for Co/SiO2 deactivation, while the deactivation of Co/Ru/SiO2 and Co/Ru/SiO2-S was only attributed to the growth of cobalt crystallite. The stability of the catalysts was in order of Co/Ru/SiO2-S > Co/SiO2 > Co/Ru/SiO2. Compared with Co/SiO2, the faster deactivation rate for Co/Ru/SiO2 was ascribed to the agglomeration of smaller metal clusters, which were more unstable than the larger metal clusters and therefore more susceptible to sintering processes. Co/Ru/SiO2-S showed the best stability because of no formation of cobalt silicates species and the slow growth of cobalt crystallite.

Key words: cobalt, ruthenium, Fischer-Tropsch synthesis, hydrophobically-organic modification, deactivation