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Article

Enhancing CO2 Conversion to CO over Plasma-Deposited Composites Based on Mixed Co and Fe Oxides

by
Hanna Kierzkowska-Pawlak
1,*,
Małgorzata Ryba
1,
Maciej Fronczak
1,
Ryszard Kapica
1,
Jan Sielski
1,
Maciej Sitarz
2,
Patryk Zając
2,
Klaudia Łyszczarz
2 and
Jacek Tyczkowski
1
1
Department of Molecular Engineering, Faculty of Process and Environmental Engineering, Lodz University of Technology, Wolczanska 213, 90-924 Lodz, Poland
2
Department of Silicates and Macromolecular Compounds, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30-059 Kraków, Poland
*
Author to whom correspondence should be addressed.
Catalysts 2021, 11(8), 883; https://doi.org/10.3390/catal11080883
Submission received: 25 June 2021 / Revised: 20 July 2021 / Accepted: 21 July 2021 / Published: 22 July 2021
(This article belongs to the Special Issue Towards Catalysts Prepared by Cold Plasma)
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Abstract

The hydrogenation of CO2 to produce CO and H2O, known as reverse-water-gas shift reaction (RWGS) is considered to be an important CO2 valorization pathway. This work is aimed at proposing the thin-film catalysts based on iron and cobalt oxides for this purpose. A series of Fe–Co nanocomposites were prepared by the plasma-enhanced chemical vapor deposition (PECVD) from organic cobalt and iron precursors on a wire-mesh support. The catalysts were characterized by SEM/EDX, XPS, XRD, and Raman spectroscopy and studied for hydrogenation of CO2 in a tubular reactor operating in the temperature range of 250–400 °C and atmospheric pressure. The Co-based catalyst, containing crystalline CoO phase, exhibited high activity toward CH4, while the Fe-based catalyst, containing crystalline Fe2O3/Fe3O4 phases, was less active and converted CO2 mainly into CO. Regarding the Fe–Co nanocomposites (incl. Fe2O3/Fe3O4 and CoO), even a small fraction of iron dramatically inhibited the production of methane. With increasing the atomic fraction of iron in the Fe–Co systems, the efficiency of the RWGS reaction at 400 °C increased up to 95% selectivity to CO and 30% conversion of CO2, which significantly exceeded the conversion for pure iron–based films (approx. 9%). The superior performance of the Fe–Co nanocomposites compared to “pure” Co and Fe–based films was proposed to be explained by assuming changes in the electronic structure of the catalyst resulting from the formation of p–n junctions between nanoparticles of cobalt and iron oxides.
Keywords: thin-film catalyst; plasma deposition; CO2 hydrogenation; cobalt oxides; iron oxides; nanocomposites thin-film catalyst; plasma deposition; CO2 hydrogenation; cobalt oxides; iron oxides; nanocomposites
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MDPI and ACS Style

Kierzkowska-Pawlak, H.; Ryba, M.; Fronczak, M.; Kapica, R.; Sielski, J.; Sitarz, M.; Zając, P.; Łyszczarz, K.; Tyczkowski, J. Enhancing CO2 Conversion to CO over Plasma-Deposited Composites Based on Mixed Co and Fe Oxides. Catalysts 2021, 11, 883. https://doi.org/10.3390/catal11080883

AMA Style

Kierzkowska-Pawlak H, Ryba M, Fronczak M, Kapica R, Sielski J, Sitarz M, Zając P, Łyszczarz K, Tyczkowski J. Enhancing CO2 Conversion to CO over Plasma-Deposited Composites Based on Mixed Co and Fe Oxides. Catalysts. 2021; 11(8):883. https://doi.org/10.3390/catal11080883

Chicago/Turabian Style

Kierzkowska-Pawlak, Hanna, Małgorzata Ryba, Maciej Fronczak, Ryszard Kapica, Jan Sielski, Maciej Sitarz, Patryk Zając, Klaudia Łyszczarz, and Jacek Tyczkowski. 2021. "Enhancing CO2 Conversion to CO over Plasma-Deposited Composites Based on Mixed Co and Fe Oxides" Catalysts 11, no. 8: 883. https://doi.org/10.3390/catal11080883

APA Style

Kierzkowska-Pawlak, H., Ryba, M., Fronczak, M., Kapica, R., Sielski, J., Sitarz, M., Zając, P., Łyszczarz, K., & Tyczkowski, J. (2021). Enhancing CO2 Conversion to CO over Plasma-Deposited Composites Based on Mixed Co and Fe Oxides. Catalysts, 11(8), 883. https://doi.org/10.3390/catal11080883

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