US EPA

4783985 

Journal Article 

Relation between hydrocarbon selectivity and cobalt particle size for alumina supported cobalt Fischer-Tropsch catalysts 

Rane, S; Borg, O; Rytter, E; Holmen, A 

2012 

1 

Applied Catalysis A: General
ISSN: 0926-860X
EISSN: 1873-3875 

437 

10-17 

10.1016/j.apcata.2012.06.005 

WOS:000307690700002 

http://www.sciencedirect.com/science/article/pii/S0926860X12003377
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The relation between hydrocarbon selectivity and cobalt particle size was studied using different alumina supports. Alumina phases. i.e. delta-, theta- and alpha-Al2O3 were produced from a small and a medium pore gamma-Al2O3 by heat treatment. All catalysts were prepared by incipient wetness impregnation resulting in a cobalt loading of 12, 20 and 30 wt.% cobalt. The catalysts were tested in a fixed bed reactor at 20 bar, 483K and H-2/CO = 2.1. The relation between methane, olefin and C5+ selectivities was studied for 2-14nm cobalt particles supported on delta- and theta-Al2O3 supports prepared from the two different gamma-Al2O3. The C5+ selectivity increases with increasing Co particle size for particles less than 8-9 nm where the selectivity goes through a maximum. The C5+ selectivity decreases for larger Co particles and then seems to approach a constant value independent of the alumina phase and pore size. The lowest CH4 selectivity and the highest olefin to paraffin ratio were obtained at maximum C5+ selectivity. (C) 2012 Elsevier B.V. All rights reserved. 

Alumina; Cobalt; Particle size; Fischer-Tropsch; C5+ selectivity