Non-Stoichiometric Ba<sub>x</sub>Mn<sub>0.7</sub>Cu<sub>0.3</sub>O<sub>3</sub> Perovskites as Catalysts for CO Oxidation: Optimizing the Ba Content
In this work, a series of Ba<sub>x</sub>Mn<sub>0.7</sub>Cu<sub>0.3</sub>O<sub>3</sub> samples (x: 1, 0.9, 0.8, and 0.7, BxMC) was synthesized, characterized, and used as catalysts for CO oxidation reaction. All formulations were active for CO oxidation...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/2/103 |
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| Summary: | In this work, a series of Ba<sub>x</sub>Mn<sub>0.7</sub>Cu<sub>0.3</sub>O<sub>3</sub> samples (x: 1, 0.9, 0.8, and 0.7, BxMC) was synthesized, characterized, and used as catalysts for CO oxidation reaction. All formulations were active for CO oxidation in the tested conditions. A correlation between the electrical conductivity, obtained by impedance spectroscopy, and the reducibility of the samples, obtained by H<sub>2</sub>-TPR, was observed. The Ba<sub>0.8</sub>Mn<sub>0.7</sub>Cu<sub>0.3</sub>O<sub>3</sub> composition (B0.8MC) showed the best catalytic performance (comparable to that of the 1% Pt/Al<sub>2</sub>O<sub>3</sub> reference sample) during tests conducted under conditions similar to those found in the exhaust gases of current gasoline engines. The characterization data suggest the simultaneous presence of a high Mn(IV)/Mn(III) surface ratio, oxygen vacancies, and reduced copper species, these two latter being key properties for ensuring a high CO conversion percentage as both are active sites for CO oxidation. The reaction temperature and the reactant atmosphere composition seem to be the most important factors for achieving a good catalytic performance, as they strongly determine the location and stability of the reduced copper species. |
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| ISSN: | 2079-4991 |