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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2025-01-01
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| author | Álvaro Díaz-Verde Emerson Luiz dos Santos Veiga Héctor Beltrán-Mir María José Illán-Gómez Eloísa Cordoncillo-Cordoncillo |
| author_facet | Álvaro Díaz-Verde Emerson Luiz dos Santos Veiga Héctor Beltrán-Mir María José Illán-Gómez Eloísa Cordoncillo-Cordoncillo |
| author_sort | Álvaro Díaz-Verde |
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| description | 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. |
| format | Article |
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| institution | Kabale University |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Nanomaterials |
| spelling | doaj-art-2c109b974c0145f9a94b5f0f8860271f2025-01-24T13:44:09ZengMDPI AGNanomaterials2079-49912025-01-0115210310.3390/nano15020103Non-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 ContentÁlvaro Díaz-Verde0Emerson Luiz dos Santos Veiga1Héctor Beltrán-Mir2María José Illán-Gómez3Eloísa Cordoncillo-Cordoncillo4Carbon 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, SpainDepartment of Inorganic and Organic Chemistry, University Jaume I, Av. Vicent Sos Baynat s/n, 12071 Castellón de la Plana, SpainDepartment of Inorganic and Organic Chemistry, University Jaume I, Av. Vicent Sos Baynat s/n, 12071 Castellón de la Plana, SpainCarbon 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, SpainDepartment of Inorganic and Organic Chemistry, University Jaume I, Av. Vicent Sos Baynat s/n, 12071 Castellón de la Plana, SpainIn 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.https://www.mdpi.com/2079-4991/15/2/103perovskitemanganesecopperCO oxidationBa non-stoichiometry |
| spellingShingle | Álvaro Díaz-Verde Emerson Luiz dos Santos Veiga Héctor Beltrán-Mir María José Illán-Gómez Eloísa Cordoncillo-Cordoncillo 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 Nanomaterials perovskite manganese copper CO oxidation Ba non-stoichiometry |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | perovskite manganese copper CO oxidation Ba non-stoichiometry |
| url | https://www.mdpi.com/2079-4991/15/2/103 |
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