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Effect of water on the space-time yield of different supported cobalt catalysts during Fischer-Tropsch synthesis
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
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2011 (English)In: Applied Catalysis A: General, ISSN 0926-860X, E-ISSN 1873-3875, Vol. 393, no 1-2, 109-121 p.Article in journal (Refereed) Published
Abstract [en]

The effect of partial pressure of water on the Fischer-Tropsch (FT) rate of six cobalt-based catalysts supported on three different carrier materials (gamma-Al2O3, alpha-Al2O3, TiO2) with varying Co particle sizes was investigated in a fixed-bed reactor by changing space velocity and by external water vapour addition. A typical catalyst pellet size (<100 mu m) for industrial slurry-bed FT reactors was used. Water was found to have a positive kinetic effect, at least up to moderate amounts, on the FT rate of all catalysts in the present study, including the gamma-Al2O3-supported catalyst with pores smaller than similar to 10 nm. The reason for the apparent negative effect on the space-time yield at a direct exposure of Co supported on narrowpore gamma-Al2O3 to high partial pressures of water is due to a rapid and extensive deactivation. This could be ascribed to formation of hard-to-reduce oxidized cobalt species. The choice of support material was found to have a major effect on the response to changes in partial pressure of water, both with respect to deactivation behaviour and kinetics. However, there is a minor Co-particle size effect on the magnitude of the kinetic effect of water, larger Co particles showing a more positive response. Different extents of mass transfer limitations and/or differences in fugacities of H-2, CO and water among the six catalysts could be ruled out as causes for the observed differences.

Place, publisher, year, edition, pages
2011. Vol. 393, no 1-2, 109-121 p.
Keyword [en]
Fischer-Tropsch, Cobalt, Water, Deactivation, Particle size, Microemulsion
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-31381DOI: 10.1016/j.apcata.2010.11.030ISI: 000287619400014Scopus ID: 2-s2.0-78951475669OAI: oai:DiVA.org:kth-31381DiVA: diva2:403820
Note
QC 20110315Available from: 2011-03-15 Created: 2011-03-14 Last updated: 2017-12-11Bibliographically approved

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