Size effect of the carbon-supported bimetallic Fe-Co nanoparticles on the catalytic activity in the Fischer-Tropsch synthesis

[Display omitted] •Fe-Co nanoparticles of 5–14 nm supported on chitosan-derived carbon were prepared.•FTS was conducted without pre-reduction of the catalysts.•10 nm Fe-Co nanoalloys showed a high specific activity (126 μmolCO/(gFe-Co·s)).•FTS activity and selectivity strongly depend on the Fe-Co na...

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Published in:Fuel (Guildford) 2022-02, Vol.310, p.122455, Article 122455
Main Authors: Vasilev, Andrey A., Ivantsov, Mikhail I., Dzidziguri, Ella L., Efimov, Mikhail N., Muratov, Dmitry G., Kulikova, Maya V., Zhilyaeva, Natalia A., Karpacheva, Galina P.
Format: Article
Language:English
Subjects:
Bimetals
Carbon
Catalysts
Catalytic activity
Chemical synthesis
Chitosan
Cobalt
Fe-Co solid solution
Ferrous alloys
Fischer-Tropsch process
Fischer-Tropsch synthesis
Iron
Metal–carbon nanocomposites
Nanoalloys
Nanoparticles
Particle size
Polymers
Prepolymers
Selectivity
Size effects
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Summary:[Display omitted] •Fe-Co nanoparticles of 5–14 nm supported on chitosan-derived carbon were prepared.•FTS was conducted without pre-reduction of the catalysts.•10 nm Fe-Co nanoalloys showed a high specific activity (126 μmolCO/(gFe-Co·s)).•FTS activity and selectivity strongly depend on the Fe-Co nanoparticle size. Carbon-supported bimetallic Fe-Co nanocatalysts with different particle sizes have been synthesized by one-pot method involving simultaneous metal nanoparticles formation and chitosan carbonization. The Fe-Co particle size has been found to vary from 5 to 14 nm depending on the amount of metal loaded in the polymer precursor. For the first time, the size effect of Fe-Co alloy nanoparticles on the specific catalyst activity, yield and selectivity of the products of the Fischer-Tropsch synthesis has been studied. It has been revealed that smaller size of the Fe-Co nanoparticles allows to achieve the maximum selectivity towards C5+ hydrocarbons at lower reaction temperature. The catalyst with the Fe-Co average particle size of 10 nm has been demonstrated the highest specific activity (per unit mass) of 126 μmolCO/(gFe-Co·s). The structure of the Fe-Co bimetallic nanoparticles formed in the composites with different initial metal loading was studied and reviewed for details by XRD analysis.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2021.122455