Potential of CoMn2O4 spinel as soot oxidation catalyst and its kinetics thereof
Abstract Efficient catalysts for soot oxidation are critical for mitigating environmental pollution. In this study, CoMn2O4 spinel catalysts were synthesised using reverse co-precipitation and co-precipitation methods to evaluate their performance in soot oxidation and kinetic behaviour. All samples...
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Nature Portfolio
2025-01-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-85736-2 |
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| author | R. Nithya Sunaina S. Patil Hari Prasad Dasari Harshini Dasari S. Nethaji |
| author_facet | R. Nithya Sunaina S. Patil Hari Prasad Dasari Harshini Dasari S. Nethaji |
| author_sort | R. Nithya |
| collection | DOAJ |
| description | Abstract Efficient catalysts for soot oxidation are critical for mitigating environmental pollution. In this study, CoMn2O4 spinel catalysts were synthesised using reverse co-precipitation and co-precipitation methods to evaluate their performance in soot oxidation and kinetic behaviour. All samples exhibited a tetragonal phase (XRD) and spherical morphology with rough surfaces (SEM). Raman spectroscopy confirmed structural disorder and oxygen vacancies, while XPS analysis revealed the presence of low-valence Mn ions, facilitating oxygen vacancy formation critical for soot oxidation. Additionally, the co-existence of Co and Mn ions contributed to a synergistic effect, enhancing the catalytic properties of the spinel structure. The reverse co-precipitation method produced a catalyst with a higher concentration of oxygen vacancies and active oxygen species among the samples. This sample demonstrated superior catalytic performance, achieving a T50% of 424 °C, low activation energy (153 kJ/mol) and pre-exponential factor (25 min− 1). Soot TPR analysis highlighted the role of catalyst reducibility, while thermogravimetric analysis revealed that activation energy and pre-exponential factors were influenced by surface composition. These findings provide valuable insights into the design of efficient catalysts for soot oxidation, emphasising the importance of synthesis methods and surface characteristics. |
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| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
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| publisher | Nature Portfolio |
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| spelling | doaj-art-5bf682d8c74346088df7cebcada409652025-01-12T12:19:02ZengNature PortfolioScientific Reports2045-23222025-01-0115111310.1038/s41598-025-85736-2Potential of CoMn2O4 spinel as soot oxidation catalyst and its kinetics thereofR. Nithya0Sunaina S. Patil1Hari Prasad Dasari2Harshini Dasari3S. Nethaji4Department of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher EducationEnergy & Catalysis Materials Laboratory, Department of Chemical Engineering, National Institute of Technology KarnatakaEnergy & Catalysis Materials Laboratory, Department of Chemical Engineering, National Institute of Technology KarnatakaDepartment of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher EducationDepartment of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher EducationAbstract Efficient catalysts for soot oxidation are critical for mitigating environmental pollution. In this study, CoMn2O4 spinel catalysts were synthesised using reverse co-precipitation and co-precipitation methods to evaluate their performance in soot oxidation and kinetic behaviour. All samples exhibited a tetragonal phase (XRD) and spherical morphology with rough surfaces (SEM). Raman spectroscopy confirmed structural disorder and oxygen vacancies, while XPS analysis revealed the presence of low-valence Mn ions, facilitating oxygen vacancy formation critical for soot oxidation. Additionally, the co-existence of Co and Mn ions contributed to a synergistic effect, enhancing the catalytic properties of the spinel structure. The reverse co-precipitation method produced a catalyst with a higher concentration of oxygen vacancies and active oxygen species among the samples. This sample demonstrated superior catalytic performance, achieving a T50% of 424 °C, low activation energy (153 kJ/mol) and pre-exponential factor (25 min− 1). Soot TPR analysis highlighted the role of catalyst reducibility, while thermogravimetric analysis revealed that activation energy and pre-exponential factors were influenced by surface composition. These findings provide valuable insights into the design of efficient catalysts for soot oxidation, emphasising the importance of synthesis methods and surface characteristics.https://doi.org/10.1038/s41598-025-85736-2Reverse co-precipitationSpinel oxideSoot oxidationSoot oxidation kinetics |
| spellingShingle | R. Nithya Sunaina S. Patil Hari Prasad Dasari Harshini Dasari S. Nethaji Potential of CoMn2O4 spinel as soot oxidation catalyst and its kinetics thereof Scientific Reports Reverse co-precipitation Spinel oxide Soot oxidation Soot oxidation kinetics |
| title | Potential of CoMn2O4 spinel as soot oxidation catalyst and its kinetics thereof |
| title_full | Potential of CoMn2O4 spinel as soot oxidation catalyst and its kinetics thereof |
| title_fullStr | Potential of CoMn2O4 spinel as soot oxidation catalyst and its kinetics thereof |
| title_full_unstemmed | Potential of CoMn2O4 spinel as soot oxidation catalyst and its kinetics thereof |
| title_short | Potential of CoMn2O4 spinel as soot oxidation catalyst and its kinetics thereof |
| title_sort | potential of comn2o4 spinel as soot oxidation catalyst and its kinetics thereof |
| topic | Reverse co-precipitation Spinel oxide Soot oxidation Soot oxidation kinetics |
| url | https://doi.org/10.1038/s41598-025-85736-2 |
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