Effect of potassium addition on coprecipitated iron catalysts for Fischer-Tropsch synthesis using bio-oil-syngas

Zhao-xiang Wang, Ting Dong, Tao Kan, Quan-xin Li

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effects of potassium addition and the potassium content on the activity and selectivity of coprecipitated iron catalyst for Fischer-Tropsch synthesis (FTS) were studied in a fixed bed reactor at 1.5 MPa, 300°C, and contact time (W/F) of 12.5 gcath/mol using the model bio-oil-syngas of H₂/CO/CO₂/N₂ (62/8/25/5, vol%). It was found that potassium addition increases the catalyst activity for FTS and the reverse water gas shift reaction. Moreover, potassium increases the average molecular weight (chain length) of the hydrocarbon products. With the increase of potassium content, it was found that CH₄ selectivity decreases and the selectivity of liquid phase products (C⁵⁺) increases. The characteristics of FTS catalysts with different potassium content were also investigated by various characterization measurements including X-ray diffraction, X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller surface area. Based on experimental results, 100Fe/6Cu/16Al/6K (weight ratio) was selected as the optimal catalyst for FTS from bio-oil-syngas. The results indicate that the 100Fe/6Cu/16Al/6K catalyst is one of the most promising candidates to directly synthesize liquid bio-fuel using bio-oil-syngas.
Original languageEnglish
Pages (from-to)141-150
Number of pages10
JournalChinese Journal of Chemical Physics
Volume21
Issue number2
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Bio-oil-syngas
  • Coprecipitated iron
  • Fischer-Tropsch synthesis
  • Potassium

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