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Promoting effect of CeO2, ZrO2 and Ce/Zr mixed oxides on Co/Γ-Al2O3 catalyst for Fischer-Tropsch synthesis
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2019 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 132, p. 1141-1150Article in journal (Refereed) Published
Abstract [en]

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 Co–Al 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.

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. Vol. 132, p. 1141-1150
Keywords [en]
Cobalt-based catalysts, GTL, Higher hydrocarbon selectivity, Oxide promoter, Support acidity, Zr–Ce oxides, Alumina, Aluminum oxide, Catalyst activity, Catalyst selectivity, Cobalt, Cobalt compounds, Fischer-Tropsch synthesis, Hydrocarbons, Zirconia, Catalytic performance, Chemical compositions, Higher hydrocarbons, Long chain hydrocarbons, Physicochemical property, Promotion effects, Textural properties, Cerium oxide, acidity, aluminum, catalyst, cerium, chemical composition, chemical reaction, hydrocarbon, oxide, zircon
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236317DOI: 10.1016/j.renene.2018.08.080ISI: 000449892900090Scopus ID: 2-s2.0-85052734534OAI: oai:DiVA.org:kth-236317DiVA, id: diva2:1263702
Note

QC 20181116

Available from: 2018-11-16 Created: 2018-11-16 Last updated: 2018-12-07Bibliographically approved

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Barrientos, JavierBoutonnet, Magali

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