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Influence of Reduction Promoters on Stability of Cobalt/g-Alumina Fischer-Tropsch Synthesis Catalysts

Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, USA
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Catalysts 2014, 4(1), 49-76; https://doi.org/10.3390/catal4010049
Received: 31 October 2013 / Revised: 13 January 2014 / Accepted: 20 February 2014 / Published: 11 March 2014
(This article belongs to the Special Issue Advances in Catalyst Deactivation)
This focused review article underscores how metal reduction promoters can impact deactivation phenomena associated with cobalt Fischer-Tropsch synthesis catalysts. Promoters can exacerbate sintering if the additional cobalt metal clusters, formed as a result of the promoting effect, are in close proximity at the nanoscale to other cobalt particles on the surface. Recent efforts have shown that when promoters are used to facilitate the reduction of small crystallites with the aim of increasing surface Co0 site densities (e.g., in research catalysts), ultra-small crystallites (e.g., <2–4.4 nm) formed are more susceptible to oxidation at high conversion relative to larger ones. The choice of promoter is important, as certain metals (e.g., Au) that promote cobalt oxide reduction can separate from cobalt during oxidation-reduction (regeneration) cycles. Finally, some elements have been identified to promote reduction but either poison the surface of Co0 (e.g., Cu), or produce excessive light gas selectivity (e.g., Cu and Pd, or Au at high loading). Computational studies indicate that certain promoters may inhibit polymeric C formation by hindering C-C coupling. View Full-Text
Keywords: Fischer-Tropsch synthesis; cobalt; deactivation; promoters Fischer-Tropsch synthesis; cobalt; deactivation; promoters
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Jacobs, G.; Ma, W.; Davis, B.H. Influence of Reduction Promoters on Stability of Cobalt/g-Alumina Fischer-Tropsch Synthesis Catalysts. Catalysts 2014, 4, 49-76.

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