CO<sub>2</sub> Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts
The thermo-catalytic synthesis of hydrocarbons from CO<sub>2</sub> and H<sub>2</sub> is of great interest for the conversion of CO<sub>2</sub> into valuable chemicals and fuels. In this work, we aim to contribute to the fundamental understanding of the effect of a...
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MDPI AG
2020-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/7/1360 |
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| author | Marco Calizzi Robin Mutschler Nicola Patelli Andrea Migliori Kun Zhao Luca Pasquini Andreas Züttel |
| author_facet | Marco Calizzi Robin Mutschler Nicola Patelli Andrea Migliori Kun Zhao Luca Pasquini Andreas Züttel |
| author_sort | Marco Calizzi |
| collection | DOAJ |
| description | The thermo-catalytic synthesis of hydrocarbons from CO<sub>2</sub> and H<sub>2</sub> is of great interest for the conversion of CO<sub>2</sub> into valuable chemicals and fuels. In this work, we aim to contribute to the fundamental understanding of the effect of alloying on the reaction yield and selectivity to a specific product. For this purpose, Fe-Co alloy nanoparticles (nanoalloys) with 30, 50 and 76 wt% Co content are synthesized via the Inert Gas Condensation method. The nanoalloys show a uniform composition and a size distribution between 10 and 25 nm, determined by means of X-ray diffraction and electron microscopy. The catalytic activity for CO<sub>2</sub> hydrogenation is investigated in a plug flow reactor coupled with a mass spectrometer, carrying out the reaction as a function of temperature (393–823 K) at ambient pressure. The Fe-Co nanoalloys prove to be more active and more selective to CO than elemental Fe and Co nanoparticles prepared by the same method. Furthermore, the Fe-Co nanoalloys catalyze the formation of C<sub>2</sub>-C<sub>5</sub> hydrocarbon products, while Co and Fe nanoparticles yield only CH<sub>4</sub> and CO, respectively. We explain this synergistic effect by the simultaneous variation in CO<sub>2</sub> binding energy and decomposition barrier as the Fe/Co ratio in the nanoalloy changes. With increasing Fe content, increased activation temperatures for the formation of CH<sub>4</sub> (from 440 K to 560 K) and C<sub>2</sub>-C<sub>5</sub> hydrocarbons (from 460 K to 560 K) are observed. |
| first_indexed | 2024-03-10T18:31:45Z |
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| language | English |
| last_indexed | 2024-03-10T18:31:45Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-9af269bed8bc47cca946a6a70d6b20732023-11-20T06:32:32ZengMDPI AGNanomaterials2079-49912020-07-01107136010.3390/nano10071360CO<sub>2</sub> Hydrogenation over Unsupported Fe-Co Nanoalloy CatalystsMarco Calizzi0Robin Mutschler1Nicola Patelli2Andrea Migliori3Kun Zhao4Luca Pasquini5Andreas Züttel6Laboratory of Materials for Renewable Energy, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1951 Sion, SwitzerlandLaboratory of Materials for Renewable Energy, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1951 Sion, SwitzerlandDepartment of Physics and Astronomy, Alma Mater Studiorum Università di Bologna, 40127 Bologna, ItalyUnit of Bologna, Institute of Microelectronics and Microsystems, National Research Council, 40129 Bologna, ItalyLaboratory of Materials for Renewable Energy, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1951 Sion, SwitzerlandDepartment of Physics and Astronomy, Alma Mater Studiorum Università di Bologna, 40127 Bologna, ItalyLaboratory of Materials for Renewable Energy, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1951 Sion, SwitzerlandThe thermo-catalytic synthesis of hydrocarbons from CO<sub>2</sub> and H<sub>2</sub> is of great interest for the conversion of CO<sub>2</sub> into valuable chemicals and fuels. In this work, we aim to contribute to the fundamental understanding of the effect of alloying on the reaction yield and selectivity to a specific product. For this purpose, Fe-Co alloy nanoparticles (nanoalloys) with 30, 50 and 76 wt% Co content are synthesized via the Inert Gas Condensation method. The nanoalloys show a uniform composition and a size distribution between 10 and 25 nm, determined by means of X-ray diffraction and electron microscopy. The catalytic activity for CO<sub>2</sub> hydrogenation is investigated in a plug flow reactor coupled with a mass spectrometer, carrying out the reaction as a function of temperature (393–823 K) at ambient pressure. The Fe-Co nanoalloys prove to be more active and more selective to CO than elemental Fe and Co nanoparticles prepared by the same method. Furthermore, the Fe-Co nanoalloys catalyze the formation of C<sub>2</sub>-C<sub>5</sub> hydrocarbon products, while Co and Fe nanoparticles yield only CH<sub>4</sub> and CO, respectively. We explain this synergistic effect by the simultaneous variation in CO<sub>2</sub> binding energy and decomposition barrier as the Fe/Co ratio in the nanoalloy changes. With increasing Fe content, increased activation temperatures for the formation of CH<sub>4</sub> (from 440 K to 560 K) and C<sub>2</sub>-C<sub>5</sub> hydrocarbons (from 460 K to 560 K) are observed.https://www.mdpi.com/2079-4991/10/7/1360nanoparticlenanoalloycatalystCO<sub>2</sub> reductionhydrocarbonsynthetic fuel |
| spellingShingle | Marco Calizzi Robin Mutschler Nicola Patelli Andrea Migliori Kun Zhao Luca Pasquini Andreas Züttel CO<sub>2</sub> Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts Nanomaterials nanoparticle nanoalloy catalyst CO<sub>2</sub> reduction hydrocarbon synthetic fuel |
| title | CO<sub>2</sub> Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts |
| title_full | CO<sub>2</sub> Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts |
| title_fullStr | CO<sub>2</sub> Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts |
| title_full_unstemmed | CO<sub>2</sub> Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts |
| title_short | CO<sub>2</sub> Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts |
| title_sort | co sub 2 sub hydrogenation over unsupported fe co nanoalloy catalysts |
| topic | nanoparticle nanoalloy catalyst CO<sub>2</sub> reduction hydrocarbon synthetic fuel |
| url | https://www.mdpi.com/2079-4991/10/7/1360 |
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