Influence of the composition and preparation method of KFeCo/γ-Al2O3 catalysts on their catalytic behaviour in the hydrocarbons synthesis from CO2

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Abstract

A series of iron-containing catalysts supported on γ-Al2O3 and modified with potassium and cobalt were studied in the reaction of hydrocarbon synthesis from CO2. Samples from different series differed in the deposition method and component ratios. When preparing catalysts modified with cobalt and potassium by co-impregnation in excess of impregnation solution, an uneven distribution of cobalt and iron cations was observed on the catalyst surface. Applying iron and modifiers by consecutive impregnation in excess of impregnation solution with intermediate heat treatment in air allows for a uniform distribution of cobalt and iron cations. This leads to a significant increase in selectivity for C5+ hydrocarbons formation and a decrease in methane selectivity. For catalysts prepared by the consecutive impregnation method, the optimal cobalt-to-iron ratio was found to be nCo/nFe ≈ 0.35–0.45, along with an iron active component content of ωFe ≈ 4%.

About the authors

E. V Dokuchits

Boreskov Institute of Catalysis SB RAS

Email: oschtan@catalysis.ru
Novosibirsk, Russia

G. I Maltsev

Boreskov Institute of Catalysis SB RAS

Novosibirsk, Russia

A. V Ishchenko

Boreskov Institute of Catalysis SB RAS

Novosibirsk, Russia

T. P Minyukova

Boreskov Institute of Catalysis SB RAS

Novosibirsk, Russia

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