Enhanced Low-Temperature Activity of Toluene Oxidation over the Rod-like MnO2/LaMnO3 Perovskites with Alkaline Hydrothermal and Acid-Etching Treatment

  • Shihao Wang
    Shihao Wang
    Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, PR China
    National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing 100084, PR China
    More by Shihao Wang
  • Qi Liu
    Qi Liu
    Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, PR China
    National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing 100084, PR China
    More by Qi Liu
  • Ziqi Zhao
    Ziqi Zhao
    National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing 100084, PR China
    More by Ziqi Zhao
  • Chi Fan
    Chi Fan
    National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing 100084, PR China
    More by Chi Fan
  • Xiaoping Chen
    Xiaoping Chen
    National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing 100084, PR China
  • Gang Xu*
    Gang Xu
    Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, PR China
    *(G.X.) Email: [email protected]
    More by Gang Xu
  • Minghong Wu
    Minghong Wu
    Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, PR China
    More by Minghong Wu
  • Jianjun Chen*
    Jianjun Chen
    National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing 100084, PR China
    *(J.C.) Email: [email protected]
    More by Jianjun Chen
  • , and 
  • Junhua Li
    Junhua Li
    National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing 100084, PR China
    More by Junhua Li
Cite this: Ind. Eng. Chem. Res. 2020, 59, 14, 6556–6564
Publication Date (Web):March 6, 2020
https://doi.org/10.1021/acs.iecr.0c00373
Copyright © 2020 American Chemical Society
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Abstract

The MnO2/LaMnO3 catalyst with the rod-like morphology obtained by alkaline hydrothermal and acid etching treatment, performing 90% toluene conversion at 236 °C with a weight hourly space velocity of 60 000 mL·g–1·h–1. The alkaline hydrothermal strategy could modulate the morphology of LaMnO3 from block-like to rod-like, and A sites (La cations) were selectively dissolved upon subsequent acid etching treatment, constructing an enhanced porous structure. Compared with the bulk LaMnO3 perovskite, the MnO2/LaMnO3 catalyst possesses the increased ratio of Mn4+/Mn3+ on the surface, significantly improving the low-temperature catalytic activity and exhibiting a low apparent activation energy (Ea) of 38.6 kJ·mol–1. Moreover, the outcomes of XPS and O2-TPD display that the active surface oxygen species with the higher concentrations of lattice oxygen and increased surface oxygen vacancy density were endowed after alkali-acid treatments, accelerating the adsorption and reaction of toluene. This work develops a promising strategy to design MnO2/LaMnO3 catalysts with enhanced low-temperature activity for the removal of volatile organic compounds via high-efficient and low-cost treatment processes.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.iecr.0c00373.

  • Characterization details; SEM-EDS and TEM-EDS results; XPS survey; toluene conversion with long-term activity test; reaction rates of toluene oxidation normalized by the specific surface areas of the LMO samples; and catalytic performance of the reported catalysts for toluene combustion (PDF)

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