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CO2 Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts

Laboratory of Materials for Renewable Energy, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1951 Sion, Switzerland
EMPA Materials Science & Technology, 8600 Dübendorf, Switzerland
Department of Physics and Astronomy, Alma Mater Studiorum Università di Bologna, 40127 Bologna, Italy
Unit of Bologna, Institute of Microelectronics and Microsystems, National Research Council, 40129 Bologna, Italy
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(7), 1360;
Received: 19 June 2020 / Revised: 6 July 2020 / Accepted: 9 July 2020 / Published: 11 July 2020
(This article belongs to the Special Issue Nanostructured Materials for Energy Storage and Conversion)
The thermo-catalytic synthesis of hydrocarbons from CO2 and H2 is of great interest for the conversion of CO2 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 CO2 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 C2-C5 hydrocarbon products, while Co and Fe nanoparticles yield only CH4 and CO, respectively. We explain this synergistic effect by the simultaneous variation in CO2 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 CH4 (from 440 K to 560 K) and C2-C5 hydrocarbons (from 460 K to 560 K) are observed. View Full-Text
Keywords: nanoparticle; nanoalloy; catalyst; CO2 reduction; hydrocarbon; synthetic fuel; iron; cobalt nanoparticle; nanoalloy; catalyst; CO2 reduction; hydrocarbon; synthetic fuel; iron; cobalt
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MDPI and ACS Style

Calizzi, M.; Mutschler, R.; Patelli, N.; Migliori, A.; Zhao, K.; Pasquini, L.; Züttel, A. CO2 Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts. Nanomaterials 2020, 10, 1360.

AMA Style

Calizzi M, Mutschler R, Patelli N, Migliori A, Zhao K, Pasquini L, Züttel A. CO2 Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts. Nanomaterials. 2020; 10(7):1360.

Chicago/Turabian Style

Calizzi, Marco, Robin Mutschler, Nicola Patelli, Andrea Migliori, Kun Zhao, Luca Pasquini, and Andreas Züttel. 2020. "CO2 Hydrogenation over Unsupported Fe-Co Nanoalloy Catalysts" Nanomaterials 10, no. 7: 1360.

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