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Synergistic Effects of Multicomponents Produce Outstanding Soot Oxidation Activity in a Cs/Co/MnOx Catalyst

  • Meng Wang
    Meng Wang
    Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen 361021, China
    University of Chinese Academy of Sciences, Beijing 100049, China
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  • Yan Zhang*
    Yan Zhang
    Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen 361021, China
    Ningbo Urban Environment Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo 315800, China
    *Email: [email protected]. Tel: +86 574 86085855. Fax: +86 592 6190990.
    More by Yan Zhang
  • Yunbo Yu
    Yunbo Yu
    Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen 361021, China
    State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
    University of Chinese Academy of Sciences, Beijing 100049, China
    More by Yunbo Yu
  • Wenpo Shan
    Wenpo Shan
    Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen 361021, China
    Ningbo Urban Environment Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo 315800, China
    More by Wenpo Shan
  • , and 
  • Hong He
    Hong He
    Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen 361021, China
    State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
    University of Chinese Academy of Sciences, Beijing 100049, China
    More by Hong He
Cite this: Environ. Sci. Technol. 2021, 55, 1, 240–248
Publication Date (Web):December 18, 2020
https://doi.org/10.1021/acs.est.0c06082
Copyright © 2020 American Chemical Society
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Abstract

The control of soot emission from diesel vehicles is of extraordinary importance to the environment, and catalytic removal of soot is a highly effective and clean method. Here, we report a novel, non-noble metal catalyst for application in the catalytic combustion of soot with superb activity and resistance to H2O and SO2. MnOx oxide was prepared via a hydrothermal method, and then, Cs and Co were loaded on MnOx by impregnation. The 5%Cs/1%Co/MnOx catalyst displayed excellent catalytic activity with values of T10 (332 °C), T50 (371 °C), and T90 (415 °C) under loose contact. The as-prepared catalysts were investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), H2 temperature-programmed reduction (TPR), O2 temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), and X-ray absorption fine structure (XAFS). The results suggest that, after the introduction of Cs and Co into the MnOx oxide, more NO2 molecules take part in soot oxidation, exhibiting higher NO2 utilization efficiency; this is due to the synergistic effects of multiple components (Cs, Co, and Mn) promoting the generation of more surface-active oxygen and then accelerating the reaction between NO2 and soot. This study provides significant insights into the development of high-efficiency catalysts for soot oxidation, and the developed 5%Cs/1%Co/MnOx catalyst is a promising candidate for application in diesel particulate filters.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.est.0c06082.

  • Summary of characterization and catalytic activity tests of catalysts: soot oxidation activity; XRD results of the spent 5%Cs/1%Co/MnOx catalyst; HRTEM images and Mn 2p XPS of the as-prepared catalysts; Mn 3s, Mn 2p, and O 1s XPS results of the spent 5%Cs/1%Co/MnOx catalyst; relationship between the H2 consumption amounts and T50; NO2 profiles; relationship between surface-active oxygen obtained from O2-TPD and the NO2 utilization efficiency; BET surface areas, XRF, and curve-fitting results of Mn-K EXAFS for different samples; and the NO2 utilization efficiency(PDF)

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Cited By


This article is cited by 4 publications.

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  2. Yang Zheng, Yangyang Guo, Lei Luo, Jian Wang, Tingyu Zhu. Poisoning Process of the V2O5–CeO2/TiO2 Catalyst by the Cumulative Effect of CaO. Energy & Fuels 2021, 35 (18) , 14876-14884. https://doi.org/10.1021/acs.energyfuels.1c01887
  3. Peng Zhang, Xuelei Mei, Xiaochan Zhao, Jing Xiong, Yuanfeng Li, Zhen Zhao, Yuechang Wei. Boosting Catalytic Purification of Soot Particles over Double Perovskite-Type La2–xKxNiCoO6 Catalysts with an Ordered Macroporous Structure. Environmental Science & Technology 2021, 55 (16) , 11245-11254. https://doi.org/10.1021/acs.est.1c01781
  4. Yang Zheng, Yangyang Guo, Xiaofei Xu, Tingyu Zhu. Study of Cu/Mn Catalysts for Coreactions of NH3-SCR and CO Oxidation. Catalysis Letters 2021, 65 https://doi.org/10.1007/s10562-021-03759-6