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K-modified MnOδ catalysts with tunnel structure and layered structure: Facile preparation and catalytic performance for soot combustion

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Abstract

Air pollution from particulate matter produced by incomplete combustion of diesel fuel has become a serious environmental pollution problem, which can be addressed by catalytic combustion. In this work, a series of K-modified MnOδ catalysts with different microstructures were synthesized by the hydrothermal method, and the relationship between structure of the catalysts and their catalytic performance for soot combustion was studied by characterization techniques and density functional theory (DFT) calculations. Results showed that the prepared catalysts had good catalytic performance for soot combustion and could completely oxidize soot at temperatures below 400 °C. The cryptomelane-type K2−xMn8O16 (K-OMS-2) with tunnel structure had excellent NO oxidation capacity and abundance of Mn4+ ions (Mn4+/Mn3+ = 1.24) with good redox ability, and it demonstrated better soot combustion performance than layered birnessite-type K2Mn4O8 (K-OL-1). The T10, T50, and T90 temperatures of K-OMS-2 were 269, 314, and 346 °C, respectively. The K-OMS-2 catalyst also showed excellent stability after five catalytic cycles, with T10, T50, and T90 values holding in the ranges of 270 ± 2, 316 ± 2, and 348 ± 3 °C, respectively.

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Acknowledgements

This research was funded by the Key Research and Development Program of MOST (No. 2017YFE0131200) for collaboration between China and Poland; the National Natural Science Foundation of China (Nos. 22072095 and U1908204); University Joint Education Project for China-Central and Eastern European Countries (No. 2021097); National Engineering Laboratory for Mobile Source Emission Control Technology (No. NELMS2018A04); Liaoning Provincial central government guides local science and technology development funds (No. 2022JH6/100100052); Major/Key Project of Graduate Education and Teaching Reform of Shenyang Normal University (No. YJSJG120210008/YJSJG220210022); University level innovation team of Shenyang Normal University; and Major Incubation Program of Shenyang Normal University (No. ZD201901)

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  1. Chao Peng and Yu Ren contributed equally to this work.

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  1. Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, 110034, China

    Chao Peng, Chunlei Zhang, Xiaoqiang Fan, Xuehua Yu & Zhen Zhao

  2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China

    Yu Ren, Di Yu, Lanyi Wang, Zhen Zhao, Yuechang Wei & Jian Liu

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  1. Chao Peng
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Correspondence to Xuehua Yu or Zhen Zhao.

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K-modified MnOδ catalysts with tunnel structure and layered structure: Facile preparation and catalytic performance for soot combustion

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Peng, C., Ren, Y., Yu, D. et al. K-modified MnOδ catalysts with tunnel structure and layered structure: Facile preparation and catalytic performance for soot combustion. Nano Res. 16, 6187–6199 (2023). https://doi.org/10.1007/s12274-022-5242-1

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