Promoting effect of CeO2, ZrO2 and Ce/Zr mixed oxides on Co/γ-Al2O3 catalyst for Fischer-Tropsch synthesis

V. Garcilaso, J. Barrientos, L.F. Bobadilla, O.H. Laguna, M. Boutonnet, M.A. Centeno and J.A. Odriozola

Renewable Energy, 2019, vol. 132, issue C, 1141-1150

Abstract: A series of cobalt-based catalysts have been synthesized using as support γ-Al2O3 promoted by ceria/zirconia mixed oxides with a variable Ce/Zr molar ratio. The obtained catalysts demonstrated oxide promotion results in the protection of the major textural properties, especially for Zr-rich solids. Reducibility of cobalt species was enhanced by the presence of mixed oxides. The chemical composition of the oxide promoter influenced not only physicochemical properties of final catalysts but also determined their performance during the reaction. In this sense, Zr-rich systems presented a superior catalytic performance both in total conversion and in selectivity towards long chain hydrocarbons. The observed Zr-promotion effect could be explained by two significant contributions: firstly, the partial inhibition of CoAl spinel compound formation by the presence of Zr-rich phases which enhances the availability of Co actives site and secondly, Zr-associate acidic sites promote higher hydrocarbons selectivity.

Keywords: Cobalt-based catalysts; Oxide promoter; ZrCe oxides; Support acidity; Higher hydrocarbon selectivity; GTL (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:132:y:2019:i:c:p:1141-1150

DOI: 10.1016/j.renene.2018.08.080

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