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Bimetallic Iron–Cobalt Catalysts and Their Applications in Energy-Related Electrochemical Reactions

Reverse Water-Gas Shift Iron Catalyst Derived from Magnetite

Center for Catalytic Science and Technology, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE 19716, USA
Author to whom correspondence should be addressed.
Catalysts 2019, 9(9), 773;
Received: 19 August 2019 / Revised: 29 August 2019 / Accepted: 30 August 2019 / Published: 14 September 2019
(This article belongs to the Special Issue Iron and Cobalt Catalysts)
The catalytic properties of unsupported iron oxides, specifically magnetite (Fe3O4), were investigated for the reverse water-gas shift (RWGS) reaction at temperatures between 723 K and 773 K and atmospheric pressure. This catalyst exhibited a fast catalytic CO formation rate (35.1 mmol h−1 gcat.−1), high turnover frequency (0.180 s−1), high CO selectivity (>99%), and high stability (753 K, 45000 cm3h−1gcat.−1) under a 1:1 H2 to CO2 ratio. Reaction rates over the Fe3O4 catalyst displayed a strong dependence on H2 partial pressure (reaction order of ~0.8) and a weaker dependence on CO2 partial pressure (reaction order of 0.33) under an equimolar flow of both reactants. X-ray powder diffraction patterns and XPS spectra reveal that the bulk composition and structure of the post-reaction catalyst was formed mostly of metallic Fe and Fe3C, while the surface contained Fe2+, Fe3+, metallic Fe and Fe3C. Catalyst tests on pure Fe3C (iron carbide) suggest that Fe3C is not an effective catalyst for this reaction at the conditions investigated. Gas-switching experiments (CO2 or H2) indicated that a redox mechanism is the predominant reaction pathway. View Full-Text
Keywords: RWGS; iron oxides; CO2 conversion; gas-switching RWGS; iron oxides; CO2 conversion; gas-switching
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MDPI and ACS Style

Chou, C.-Y.; Loiland, J.A.; Lobo, R.F. Reverse Water-Gas Shift Iron Catalyst Derived from Magnetite. Catalysts 2019, 9, 773.

AMA Style

Chou C-Y, Loiland JA, Lobo RF. Reverse Water-Gas Shift Iron Catalyst Derived from Magnetite. Catalysts. 2019; 9(9):773.

Chicago/Turabian Style

Chou, Chen-Yu, Jason A. Loiland, and Raul F. Lobo. 2019. "Reverse Water-Gas Shift Iron Catalyst Derived from Magnetite" Catalysts 9, no. 9: 773.

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