Journal
APPLIED CATALYSIS A-GENERAL
Volume 481, Issue -, Pages 116-126Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2014.04.047
Keywords
Fischer-Tropsch synthesis; Biosyngas; Bimetallic catalysts; Cobalt catalyst; Iron catalyst
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Funding
- Nord-Pas-de-Calais Region
- FEDER
- French National Research Agency (ANR) [ANR-11-EQPX-0037]
- Agence Nationale de la Recherche (ANR) [ANR-11-EQPX-0037] Funding Source: Agence Nationale de la Recherche (ANR)
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This paper focuses on the identification of cobalt and iron species in bimetallic alumina supported catalysts and their role in Fischer-Tropsch synthesis. The catalysts are prepared via aqueous coimpregnation of alumina with solutions of cobalt and iron nitrates followed by calcination in air and reduction in hydrogen. Qualitative and quantitative analyses of cobalt and iron phases were performed using XANES/EXAFS, XRD, TPR, XPS and magnetic method. The results show that Co3O4 and Fe2O3 are the major phases in the calcined monometallic cobalt and iron catalysts, while the bimetallic catalysts also exhibited the presence of mixed Co-Fe oxides. Reduction of these Co-Fe oxides leads to cobalt-iron bimetallic particles. The Fischer-Tropsch reaction rate increases with cobalt content in bimetallic catalysts. Formation of mixed cobalt-iron species increases selectivity to lighter olefins compared to cobalt monometallic catalyst but leads to lower Fischer-Tropsch reaction rates. (C) 2014 Elsevier B.V. All rights reserved.
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