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Nanomaterials
Volume 15
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10.3390/nano15020103
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Article

Non-Stoichiometric BaxMn0.7Cu0.3O3 Perovskites as Catalysts for CO Oxidation: Optimizing the Ba Content

by
Álvaro Díaz-Verde
1,
Emerson Luiz dos Santos Veiga
2,
Héctor Beltrán-Mir
2,
María José Illán-Gómez
1,* and
Eloísa Cordoncillo-Cordoncillo
2
1
Carbon Materials and Environment Research Group, Inorganic Chemistry Department, Institute of Materials Science (IUMA), University of Alicante, Ctra San Vicente del Raspeig s/n, San Vicente dek Raspeig, 03690 Alicante, Spain
2
Department of Inorganic and Organic Chemistry, University Jaume I, Av. Vicent Sos Baynat s/n, 12071 Castellón de la Plana, Spain
*
Author to whom correspondence should be addressed.
Nanomaterials 2025, 15(2), 103; https://doi.org/10.3390/nano15020103
Submission received: 17 December 2024 / Revised: 9 January 2025 / Accepted: 9 January 2025 / Published: 10 January 2025
(This article belongs to the Section Energy and Catalysis)
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Abstract

In this work, a series of BaxMn0.7Cu0.3O3 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 H2-TPR, was observed. The Ba0.8Mn0.7Cu0.3O3 composition (B0.8MC) showed the best catalytic performance (comparable to that of the 1% Pt/Al2O3 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.
Keywords: perovskite; manganese; copper; CO oxidation; Ba non-stoichiometry perovskite; manganese; copper; CO oxidation; Ba non-stoichiometry

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MDPI and ACS Style

Díaz-Verde, Á.; dos Santos Veiga, E.L.; Beltrán-Mir, H.; Illán-Gómez, M.J.; Cordoncillo-Cordoncillo, E. Non-Stoichiometric BaxMn0.7Cu0.3O3 Perovskites as Catalysts for CO Oxidation: Optimizing the Ba Content. Nanomaterials 2025, 15, 103. https://doi.org/10.3390/nano15020103

AMA Style

Díaz-Verde Á, dos Santos Veiga EL, Beltrán-Mir H, Illán-Gómez MJ, Cordoncillo-Cordoncillo E. Non-Stoichiometric BaxMn0.7Cu0.3O3 Perovskites as Catalysts for CO Oxidation: Optimizing the Ba Content. Nanomaterials. 2025; 15(2):103. https://doi.org/10.3390/nano15020103

Chicago/Turabian Style

Díaz-Verde, Álvaro, Emerson Luiz dos Santos Veiga, Héctor Beltrán-Mir, María José Illán-Gómez, and Eloísa Cordoncillo-Cordoncillo. 2025. "Non-Stoichiometric BaxMn0.7Cu0.3O3 Perovskites as Catalysts for CO Oxidation: Optimizing the Ba Content" Nanomaterials 15, no. 2: 103. https://doi.org/10.3390/nano15020103

APA Style

Díaz-Verde, Á., dos Santos Veiga, E. L., Beltrán-Mir, H., Illán-Gómez, M. J., & Cordoncillo-Cordoncillo, E. (2025). Non-Stoichiometric BaxMn0.7Cu0.3O3 Perovskites as Catalysts for CO Oxidation: Optimizing the Ba Content. Nanomaterials, 15(2), 103. https://doi.org/10.3390/nano15020103

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