Fischer-Tropsch synthesis: Effect of halides and potassium addition on activity and selectivity of cobalt

Muthu Kumaran Gnanamani, Venkat Ramana Rao Pendyala, Gary Jacobs, Dennis E. Sparks, Wilson D. Shafer, Burtron H. Davis

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The effect of halides and potassium addition on cobalt Fischer-Tropsch synthesis (FTS) was studied using 1L CSTR at 493 K, 1.99 MPa and H 2/CO of 2.0. The potential catalyst poison was co-fed with syngas after reaching steady-state FTS. Halides were added in an aqueous solution of HX (HF, HCl, HBr) and potassium as aqueous potassium nitrate solution along with syngas at various concentration levels ranging from 500 ppbv to 100 ppmv. Fluoride addition did not affect FT performance of cobalt up to 1.0 ppmv level. However, the presence of other halides (Cl- and Br-) decreased the FT activity proportionally. Addition of potassium decreased cobalt FT activity considerably and increases syngas conversion to methane and CO 2 at higher potassium concentrations. The observed poisoning effects for metallic cobalt could be attributed to a blocking effect of cobalt metal sites by halides and potassium in agreement with results of H2 chemisorption on used cobalt FT catalysts.

Original languageEnglish
Pages (from-to)1127-1133
Number of pages7
JournalCatalysis Letters
Issue number7
StatePublished - Jul 2014


  • Cobalt catalyst
  • Fischer-Tropsch synthesis
  • Halides
  • Impurity
  • Potassium
  • Selectivity

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


Dive into the research topics of 'Fischer-Tropsch synthesis: Effect of halides and potassium addition on activity and selectivity of cobalt'. Together they form a unique fingerprint.

Cite this