Anti-ASF distribution in Fischer-Tropsch synthesis over unsupported cobalt catalysts in a batch slurry phase reactor

Xiaohao Liu, Akiyuki Hamasaki, Tetsuo Honma, Makoto Tokunaga

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Fischer-Tropsch synthesis (FTS) over unsupported coprecipitated cobalt catalysts in n-decane in a batch slurry phase reactor by adding water vapor (H2O/CO=0.12 in molar ratio) prior to reaction has been studied. The addition of water vapor exhibits a marked effect on the product selectivity. In the absence of water, the carbon number distribution of FT products follows the classical Anderson-Schulz-Flory (ASF) pattern resulting in a low selectivity (32%) in the desired C10+ hydrocarbons. In contrast, with the promotion of water vapor, the formation of heavy products is appreciably increased up to 87.3% in C10+ hydrocarbons so that the selectivity in the range of C8-C30 increases obviously along with an increase in carbon number (n), which leads to a substantial deviation from ASF pattern. The effect of water is explained by suppressing secondary hydrogenation of 1-olefins and facilitating their readsorption and chain growth.

Original languageEnglish
Pages (from-to)494-503
Number of pages10
JournalCatalysis Today
Volume175
Issue number1
DOIs
Publication statusPublished - Oct 25 2011

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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