Mechanisms of CO oxidation on high entropy spinels
Martina Fracchia
1, 2
,
Paolo Ghigna
1, 2
,
Sara Stolfi
1, 3
,
Umberto Anselmi Tamburini
1, 2
,
Mauro Coduri
1, 2
,
Luca Braglia
3, 4
,
PIERO TORELLI
3, 4
4
AREA Science Park, Trieste, Italy
|
Publication type: Journal Article
Publication date: 2025-01-27
scimago Q2
wos Q2
SJR: 0.698
CiteScore: 5.3
Impact factor: 2.9
ISSN: 14639076, 14639084
Abstract
The CO oxidation reaction on (Co,Mg,Mn,Ni,Zn)(Al,Co,Cr,Fe,Mn)2O4 and (Cr,Mn,Fe,Co,Ni)3O4 high entropy spinel oxides was studied for what concerns its mechanism by means of operando soft X-ray absorption spectroscopy. In the (Cr,Mn,Fe,Co,Ni)3O4 high entropy spinel, CO oxidation starts at ca. 150 °C, and complete conversion to CO2 is obtained at ca. 300 °C. For the (Co,Mg,Mn,Ni,Zn)(Al,Co,Cr,Fe,Mn)2O4 spinel oxides, in contrast, the reaction starts at ca. 200 °C, and complete conversion needs temperatures of the order of 350 °C. Concerning the reaction mechanism, we found that, in both cases, Mn is the active metal, via the Mn(II)/Mn(III) redox couple. CO is found to adsorb on surface Mn(III) sites and reduces them to Mn(II). The Mn(III) oxidation state is recovered by O2, yielding CO2. All the other transition metals are found to be inactive and act just as spectators. These findings are discussed in the framework of the present knowledge on high entropy oxides.
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Total citations:
4
Citations from 2024:
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(100%)
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GOST
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Fracchia M. et al. Mechanisms of CO oxidation on high entropy spinels // Physical Chemistry Chemical Physics. 2025. Vol. 27. No. 6. pp. 3412-3419.
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Fracchia M., Ghigna P., Stolfi S., Anselmi Tamburini U., Coduri M., Braglia L., TORELLI P. Mechanisms of CO oxidation on high entropy spinels // Physical Chemistry Chemical Physics. 2025. Vol. 27. No. 6. pp. 3412-3419.
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RIS
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TY - JOUR
DO - 10.1039/d4cp04359f
UR - https://xlink.rsc.org/?DOI=D4CP04359F
TI - Mechanisms of CO oxidation on high entropy spinels
T2 - Physical Chemistry Chemical Physics
AU - Fracchia, Martina
AU - Ghigna, Paolo
AU - Stolfi, Sara
AU - Anselmi Tamburini, Umberto
AU - Coduri, Mauro
AU - Braglia, Luca
AU - TORELLI, PIERO
PY - 2025
DA - 2025/01/27
PB - Royal Society of Chemistry (RSC)
SP - 3412-3419
IS - 6
VL - 27
SN - 1463-9076
SN - 1463-9084
ER -
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BibTex (up to 50 authors)
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@article{2025_Fracchia,
author = {Martina Fracchia and Paolo Ghigna and Sara Stolfi and Umberto Anselmi Tamburini and Mauro Coduri and Luca Braglia and PIERO TORELLI},
title = {Mechanisms of CO oxidation on high entropy spinels},
journal = {Physical Chemistry Chemical Physics},
year = {2025},
volume = {27},
publisher = {Royal Society of Chemistry (RSC)},
month = {jan},
url = {https://xlink.rsc.org/?DOI=D4CP04359F},
number = {6},
pages = {3412--3419},
doi = {10.1039/d4cp04359f}
}
Cite this
MLA
Copy
Fracchia, Martina, et al. “Mechanisms of CO oxidation on high entropy spinels.” Physical Chemistry Chemical Physics, vol. 27, no. 6, Jan. 2025, pp. 3412-3419. https://xlink.rsc.org/?DOI=D4CP04359F.
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