| DOI | Resolve DOI: https://doi.org/10.1016/j.jcou.2021.101824 |
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| Author | Search for: Panaritis, ChristopherORCID identifier: https://orcid.org/0000-0002-8597-3041; Search for: Yan, ShuoORCID identifier: https://orcid.org/0000-0002-9040-2112; Search for: Couillard, Martin1; Search for: Baranova, Elena A. |
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| Affiliation | - National Research Council of Canada. Energy, Mining and Environment
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| Funder | Search for: Natural Sciences and Engineering Research Council of Canada |
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| Format | Text, Article |
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| Subject | reverse water-gas shift (RWGS); iron-oxide; cobalt-oxide; metal-support interaction; self-sustained electro-promotion; electrochemical promotion of catalysis; CO₂ utilization |
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| Abstract | CO₂ transformed into CO is the initial step in the manufacturing of carbon-neutral products. Herein, the supported iron-oxide (FeOₓ) nanoparticles are investigated for the reverse water gas shift (RWGS) reaction from 200 °C to 400 °C under atmospheric conditions. The effect of the catalyst support is investigated by comparing unsupported and supported FeOₓ on Co₃O₄ and γ-Al₂O₃ supports. The FeOₓ/Co₃O₄ catalytic system displayed a high selectivity to CO (>99 %), a 1.4-fold CO₂ conversion increase over bare Co₃O₄ support and a 20-times improvement over FeOₓ/γ-Al₂O₃. The superior catalytic activity of FeOₓ/Co₃O₄ is attributed to the reducibility of Co₃O₄ under the reaction conditions and generation of oxygen vacancies. This in turn affected the electronic properties of the FeOₓ catalyst and as a result improved its catalytic activity for the RWGS reaction. To confirm the effect of oxygen vacancies in Co₃O₄ and the observed metal-support interaction (MSI), we performed electrochemical characterizations of the FeOₓ/Co₃O₄ catalyst. Under both anodic and cathodic polarization, the catalytic activity decreased by over 10 % due to the in-situ change in the oxidation state of Co₃O₄ during polarization, thus affecting the MSI effect between FeOₓ and Co₃O₄. Our study demonstrates that the application of electrochemical methods for studying the MSI effect in heterogeneous catalysts is a powerful and informative in-situ tool. |
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| Publication date | 2021-12-02 |
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| Publisher | Elsevier |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Identifier | S2212982021003917 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 53f2519c-9475-409d-ba94-bb91483b2bf4 |
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| Record created | 2023-01-13 |
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| Record modified | 2023-01-25 |
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