A judicious injection and abstraction of a hetero-dopant in a Co3O4 catalyst for efficient methane oxidation

Precise defect engineering of metal oxide catalysts holds great importance for improving catalytic oxidation reactions. In this work, a judicious strategy by doping and partially de-doping of Cr atoms was orchestrated to produce a defect-containing Co3O4 catalyst. The co-existence of the remaining C...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2024-07, Vol.12 (28), p.17463-17470
Main Authors: Sun, Shiqiang, Li, Guoling, Zhu, Shanhui, Meng, Wenhao, Xu, Leilei, Jiang, Jinlong, Fagen Wang, Li, Xingyun
Format: Article
Language:English
Subjects:
Catalysts
Catalytic converters
Chromium
Cobalt oxides
Crystal defects
Crystal structure
Dopants
Doping
Lattice vacancies
Metal oxides
Methane
Oxidation
Oxygen
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Summary:Precise defect engineering of metal oxide catalysts holds great importance for improving catalytic oxidation reactions. In this work, a judicious strategy by doping and partially de-doping of Cr atoms was orchestrated to produce a defect-containing Co3O4 catalyst. The co-existence of the remaining Cr dopant and some metal vacancies could synergistically contribute to the distortion of the crystal structure, Co–O bond activation, generation of abundant active oxygen species and enhancement of oxygen reactivity. Consequently, the catalytic performance for the methane oxidation reaction was significantly boosted, with a methane conversion rate normalized by the specific surface area of 0.114 μmol m−2 s−1, 1.41 times that of the pure Co3O4 catalyst at a reaction temperature of 295 °C. This work provides a viable methodology for improving Co3O4 catalysts for efficient methane oxidation.
ISSN:2050-7488
2050-7496
DOI:10.1039/d4ta01645a