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Cited by 20Catalytic Processes in Materials ScienceIndustrial Gas Emission ControlAdvanced Combustion Engine Technologies

Potential of CoMn2O4 spinel as soot oxidation catalyst and its kinetics thereof

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Nithya, R., Patil, Sunaina S., Dasari, Hari Prasad, Dasari, Harshini, Nethaji, S.·2025·Scientific Reports
DOI 10.1038/s41598-025-85736-2PMC PMC11706943
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Abstract

Abstract Efficient catalysts for soot oxidation are critical for mitigating environmental pollution. In this study, CoMn 2 O 4 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 T 50% 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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  • In Co 2p XPS region, both MnCo2O4 spinel and LaCoMnO3 perovskite exhibit Co2+ and Co3+ signals.

    “In the Co 2p region, both the MnCo2O4 spinel and the LaCoMnO3 perovskite exhibit Co2+ and Co3+ signals”

    From La-Co-Mn oxide aerogels as high-performance electrocatalysts for anion exchange membrane water electrolysis (2026) · cites this paper as [42]

    The Catalyst Characterisation section reports Co²⁺ and Co³⁺ signals in the Co 2p XPS spectra, but for CoMn₂O₄ samples—not the claimed MnCo₂O₄ spinel. It does not report Co 2p results for LaCoMnO₃ perovskite, so the claim about both materials is not supported. (LLM, conf=0.88)

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Cited by

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Authors
Nithya, R., Patil, S. S., Dasari, H. P., Dasari, H., & Nethaji, S.
Affiliations
  • National Institute of Technology Karnataka (IN)
  • Manipal Academy of Higher Education (IN)
Corresponding author
  • Dasari, Hari Prasad
  • Dasari, Harshini
ORCID
Venue
Scientific Reports
Publisher
Springer Science and Business Media LLC
Published
2025-01-07
Volume
15
Issue
1
Pages
1174-1174
ISSN
2045-2322 (ISSN-L)
DOI
10.1038/s41598-025-85736-2
PMC
PMC11706943
OpenAlex
W4406134578
Cited by
20
References
0
Citations by year
2026: 12 · 2025: 8
FWCI
4.22
Type
journal article
Language
en
Open access
Licence
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Manipal Academy of Higher Education, Manipal
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
  • Physical Sciences › Engineering › Mechanical Engineering › Industrial Gas Emission Control
  • Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Advanced Combustion Engine Technologies
Keywords
soot oxidation, catalytic oxidation, oxygen vacancies, reverse co-precipitation, co-precipitation synthesis, activation energy, reaction kinetics, catalyst reducibility, surface composition, diesel soot

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