Fischer-Tropsch performance correlated to catalyst structure: Trends in activity and stability for a silica-supported cobalt catalyst

Authors: Laura A. Richard, Pierre Moreau, Sreekala Rugmini, Francis Daly 

Abstract:
The influence of the cobalt particle size and particle size distribution in determining Fischer-Tropsch (FT) performance for silica supported catalysts was investigated. Using a line broadening powder X-ray diffraction analysis, both the particle size and particle size distribution of cobalt were estimated and compared to the FT activity and stability at industrially relevant conditions (210^◦C, H₂/CO = 2, 20 bar). It was shown that the apparent turnover frequency increased linearly with Co⁰ particle size up to 9.8 nm, the largest size tested. For the firsttime, it has been shown thatthe breadth ofthe particle size distribution correlates directly to catalyst stability. Using these correlations, a highly active and stable catalyst was developed, showing a deactivation rate of −0.08% CO converted/day in a microchannel reactor with an activity of 0.25 molCO gCo⁻¹ h⁻¹.

Keywords:
Fischer-Tropsch
Cobalt
Particle size
Silica
X-ray diffraction

Published in: Applied catalysis A: General  (Volumes 464–465, Pages 1-384, 15 August 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Fischer-Tropsch performance correlated to catalyst structure: Trends in activity and stability for a silica-supported cobalt catalyst

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