Study of Co/SBA-15 catalysts prepared by microwave and conventional heating methods and application in Fischer–Tropsch synthesis

Authors: Jocielys Jovelino Rodrigues, Fabiano André Narciso Fernandes, Meiry Gláucia Freire Rodrigues

Abstract:
The aim of this work was to produce a 20% (w/w) cobalt catalyst supported in SBA-15 molecular sieve, analyze it and evaluate its use in Fischer–Tropsch (FT) reaction. Two synthesis methods for the SBA15 molecular sieves were evaluated: microwave (Co/SBA15-MW) and conventional heating (Co/SBA15- CH). The Co/SBA-15 catalysts were prepared by humidity impregnation and were characterized by Xray diffraction, X-ray energy dispersion spectrophotometer, N₂ adsorption–desorption, temperatureprogrammed reduction, and transmission electron microscopy. Fischer–Tropsch synthesis was carried out to evaluate the activity of the catalyst. The synthesis was carried out in a slurry reactor operating at 513K, 20 atm, and 1:1 CO:H₂ molar ratio. X-ray diffraction showed that the calcined cobalt catalyst did not modify the structure of SBA-15 and that Co was present under the form of Co₃O₄ in the precursor. The additionof cobaltinthe SBA-15decreasedthe specific surface area ofthemolecular sieve. Fischer–Tropsch synthesis activity and C₅₊ hydrocarbon selectivity increased with the Co/SBA15-MW. The increase in activity and selectivity were attributed to the increased number of active sites as a result of the higher reducibility. The Co/SBA-15 catalysts showed moderate conversion (40%) and high selectivity towards the production of C₅₊ (79%, w/w).

Keywords:
SBA-15
Cobalt
Microwave
Slurry reactor
Fischer–Tropsch synthesis

Published in: Applied catalysis A: General   (Volume 468, Pages 1-474, 5 November 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Study of Co/SBA-15 catalysts prepared by microwave and conventional heating methods and application in Fischer–Tropsch synthesis

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