Potassium-promoted Fe2O3-ZrO2 bimetal oxides for enhanced CO2 hydrogenation activity to hydrocarbons

초록

Highly ordered structures of potassium-promoted mesoporous Fe2O3-ZrO2 mixed metal oxides with an optimal 4 wt% K revealed a superior Fischer-Tropsch synthesis (FTS) reaction activity with CO2 conversion of 29.3% and C5+ selectivity of 42.5% with a lower CO selectivity of 30.9% at T = 320 degrees C and P = 2.0 MPa, which were attributed to the suppressed reverse water-gas shift (RWGS) reaction activity. The higher catalytic activity of highly ordered mesoporous Fe2O3-ZrO2 bimetal oxides with an optimal Zr/Fe molar ratio of 0.25 with 4wt%K were mainly induced from the facile formation of active iron carbides with the help of the highly distributed potassium promoter and well-synthesized ordered mesoporous Fe2O3-ZrO2 structures with a larger specific surface area of 68.9 m2/g. The enhanced CO2 hydrogenation activity with higher C5+ selectivity was mainly attributed to the selective light olefin formations on the potassium-promoted active iron carbides phases through facile propagation reactions to selectively form heavier hydrocarbons even under water-rich environment during CO2 hydrogenation.

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