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Experimental study on supported MnO2-based catalysts for NO oxidation

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Abstract

In this paper, a single-phase supported MnO2/Al2O3 catalyst and Ce-doped MnCe/Al catalyst system were used for the NO-SCO experiment with MnO2 as the main active component. Furthermore, the effect of loading and Ce doping on active oxygen species and the important factors related to catalyst activity was revealed. The MnO2 catalyst obtained the best activity at 300 °C, corresponding to a NO conversion rate of 79.4%. After MnO2 was loaded on the γ-Al2O3, the activity of the Mn/Al catalysts was not as good as that of the MnO2 catalyst, and the temperature window of Mn/Al shifted to the high-temperature region with the increase of the loading ratio. The relative content of adsorbed oxygen Oα of Mn/Al catalysts was lower than that of MnO2, resulting in poor activity. Ce-doped Mn0.23Ce0.023/Al catalysts exhibited good low-temperature activity. The introduction of the Ce element enhanced the dispersion of Mn species on the catalyst surface, the relative content of surface adsorbed oxygen Oα increased, and the low-temperature activity and mobility of surface oxygen species were enhanced. The Mn0.23Ce0.023/Al catalyst was endowed with both a high specific surface area and good pore structure, as well as a large oxygen storage capacity and excellent surface oxygen species.

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Acknowledgements

The present work was supported by the National Natural Science Foundation of China (51906193).

Funding

National Natural Science Foundation of China,51906193,denghui wang

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Authors and Affiliations

  1. State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, No. 28 Xianning West Rd, Xi’an, 710049, China

    Feng Wu, Yuping Huang & Denghui Wang

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  1. Feng Wu
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  2. Yuping Huang
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  3. Denghui Wang
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Contributions

FW: Data curation, Formal analysis, Validation, Writing-original draft. YH: Supplementary experimental data. DW: Investigation, review & editing.

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Correspondence to Denghui Wang.

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Wu, F., Huang, Y. & Wang, D. Experimental study on supported MnO2-based catalysts for NO oxidation. Reac Kinet Mech Cat 136, 251–266 (2023). https://doi.org/10.1007/s11144-022-02343-2

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