Stability of cobalt catalyst structure and performance in Fischer-Tropsch synthesis: Supercritical fluid media vs. conventional gas phase media
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The performance of three cobalt-based catalytic systems of different characteristics in Fischer-Tropsch synthesis (FTS) in both conventional gas-phase and supercritical hexane (SCH) phase was presented. The in situ influence of the reaction media on the cobalt and support structure and characteristics was studied. The XRD and magnetic characterizations of the used catalysts revealed that in situ reducibility of the Co3O4 to hcp Co0 or fcc Co0 is taking place during the FTS reaction. However, minimal in situ reduction was observed in the case of gas-phase FTS, whereby significant changes in the reduced cobalt electronic state and support (alumina and silica) phase were detected under SCH-FTS conditions. As a result, both the activity and selectivity of the cobalt catalyst was very stable and recoverable during SCH-FTS for relatively long time-on-stream. This is an abstract of a paper presented at the 230th ACS National Meeting (Washington, DC 8/28/2005-9/1/2005).
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author list (cited authors)
Elbashir, N. O., Roberts, C. B., Dutta, P., & Seehra, M. S.