Synthesis of higher alcohols by Fischer–Tropsch synthesis over alkali metal-modified cobalt catalysts

Authors:   Tamao Ishida, Tatsuya Yanagihara, Xiaohao Liu, Hironori Ohashi, Akiyuki Hamasaki,  Tetsuo Honma, Hiroshi Oji, Takushi Yokoyama, Makoto Tokunaga

Abstract:
Alkali metal-modified unsupported and supported cobalt catalysts worked efficiently in the Fischer–Tropsch (FT) synthesis for the production of higher alcohols in a batch slurry-phase reactor. Sodium-modified Co catalysts exhibited the highest catalytic performance in terms of catalytic activity and higher alcohol selectivities compared to other alkali metal-modified Co catalysts: they also gave appreciable amounts of higher alcohols with more than four carbon atoms (C₅₊ alcohols) as much as 77% of the total alcohol distribution. According to the characterization of the catalysts using XRD, TEM, XPS, XAFS, and CO2-TPD,the effect of Na was suggested as follows:(i) a decrease in the size of Co nanoparticles, (ii) a decrease in the reducibility of Co(II) to Co(0), and (iii) an increase in surface basicity. These factors enable the production of higher alcohols with high selectivities at high CO conversions. 

Keywords:
Fischer–Tropsch synthesis
Higher alcohol
Cobalt
Alkali metal

Published in: Applied catalysis A: General  (Volume 458, Pages 1-206, 10 May 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Synthesis of higher alcohols by Fischer–Tropsch synthesis over alkali metal-modified cobalt catalysts

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