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Insights into non-crystalline structure of solid solution Ce-Mn co-oxide nanofibers for efficient low-temperature toluene oxidation

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Abstract

The controllable preparation of efficient non-crystalline solid solution catalysts is a great challenge in the catalytic oxidation of volatile organic compounds. In this work, series non-crystalline solid solution structured Ce-Mn co-oxide nanofibers were creatively prepared by adjusting Ce/Mn molar ratios using electrospinning. 0.20CeMnOx (the ratio of Ce to Mn was 0.2) displayed an outstanding low-temperature toluene oxidation activity (T90 = 233 °C). The formation of the amorphous solid solution and the unique nanofiber structure both contributed to a large specific surface area (S = 173 m2 g-1) and high adsorbed oxygen content (Oads/O = 41.3%), which enhanced the number of active oxygen vacancies. The synergies between non-crystalline structure and active oxygen species markedly improved oxygen migration rate as well as redox ability of the catalysts. Additionally, in situ diffuse reflectance infrared Fourier transform spectra showed that the absorbed toluene could be completely oxidized to CO2 and H2O with benzyl alcohol, benzaldehyde, benzoic acid, and maleic anhydride as intermediates. In summary, this study provided an alternative route for the synthesis of non-crystalline metal co-oxide nanofibers.

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Data availability

The data used in the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 21878338) and the National Key Research and Development Program of China (No. 2019YFC0214302).

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Authors and Affiliations

  1. School of Energy Science and Engineering, Central South University, Changsha, 410083, Hunan, China

    Yanzhu Chen, Zheng Zeng, Dongyang Liu, **g Zhang, Yang Guo, Jianwu Zou, Juan Guan, **ang Xu & Liqing Li

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  1. Yanzhu Chen
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  2. Zheng Zeng
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  3. Dongyang Liu
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  4. **g Zhang
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  5. Yang Guo
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  8. **ang Xu
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  9. Liqing Li
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Contributions

Yanzhu Chen, Zheng Zeng, **ang Xu, and Liqing Li proposed and conceived the research idea. Yanzhu Chen and Zheng Zeng designed the experiments. Yanzhu Chen and Dongyang Liu synthesized the catalysts. **g Zhang, Jianwu Zou and Juan Guan helped with the experiment of toluene catalytic oxidation. Yang Guo helped with the graphics. Yanzhu Chen prepared the first draft of this manuscript, and **ang Xu and Liqing Li helped to revised it.

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Correspondence to Liqing Li.

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Chen, ., Zeng, Z., Liu, D. et al. Insights into non-crystalline structure of solid solution Ce-Mn co-oxide nanofibers for efficient low-temperature toluene oxidation. Environ Sci Pollut Res 30, 99830–99841 (2023). https://doi.org/10.1007/s11356-023-29299-7

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