Effect of sequence of P and Co addition over silica for Fischer-Tropsch synthesis

Muthu Kumaran Gnanamani, Gary Jacobs, Uschi M. Graham, Venkat Ramana Rao Pendyala, Michela Martinelli, Aimee MacLennan, Yongfeng Hu, Burtron H. Davis

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The effect of the sequence of phosphorous and cobalt addition to silica on the activity and product selectivity for Fischer-Tropsch synthesis was investigated using a slurry phase continuously stirred-tank reactor. Advantages of P-modified silica supported cobalt included higher activity and C5+ selectivity in comparison with both the undoped and P-doped cobalt silica catalysts. Results of hydrogen chemisorption revealed that cobalt dispersion was higher for all three P-containing cobalt catalysts compared to the undoped cobalt catalyst. H2-TPR profiles indicate P increases the fraction of high-temperature reducible cobalt oxide species and these surface species were dominant in the case of co-impregnated and P-doped cobalt silica catalysts. P-modified silica had enhanced FT activity likely by altering the surface interactions of cobalt with the hydroxyl groups on silica.

Original languageEnglish
Pages (from-to)190-198
Number of pages9
JournalApplied Catalysis A: General
StatePublished - 2017

Bibliographical note

Funding Information:
This work carried out at the CAER was supported by the Commonwealth of Kentucky. Research described in this paper was performed in part at the Canadian Light Source, which is funded by the Canada Foundation for Innovation, the Natural Sciences and Engineering Research Council of Canada, the National Research Council Canada, the Canadian Institutes of Health Research, the Government of Saskatchewan, Western Economic Diversification Canada, and the University of Saskatchewan.

Publisher Copyright:
© 2017 Elsevier B.V.


  • Cobalt
  • Fischer-Tropsch
  • H-TPR
  • Phosphorous

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology


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