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  • The key surface species and oxygen vacancies in MnOx(0.4)-CeO2 toward repeated soot oxidation

    Author(s)
    He, Hui
    Lin, Xueting
    Li, Shujun
    Wu, Zeng
    Gao, Jingheng
    Wu, Junliang
    Wen, William
    Ye, Daiqi
    Fu, Mingli
    Griffith University Author(s)
    Wen, William Y.
    Year published
    2018
    Metadata
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    Abstract
    Surface species and oxygen vacancies were studied in MnOx(0.4)-CeO2 toward repeated soot oxidation. MnOx(0.4)-CeO2 catalysts prepared by the citric acid complex method were repeatedly used in a 10% O2/Ar gas flow and showed favorable activity and satisfactory durability toward soot oxidation. X-ray diffraction (XRD), N2 adsorption/desorption, Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS) and in situ visible/UV Raman characterization methods were utilized to investigate the structural features of fresh and reused catalysts. The irreversible conversion of high valence manganese species as well ...
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    Surface species and oxygen vacancies were studied in MnOx(0.4)-CeO2 toward repeated soot oxidation. MnOx(0.4)-CeO2 catalysts prepared by the citric acid complex method were repeatedly used in a 10% O2/Ar gas flow and showed favorable activity and satisfactory durability toward soot oxidation. X-ray diffraction (XRD), N2 adsorption/desorption, Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS) and in situ visible/UV Raman characterization methods were utilized to investigate the structural features of fresh and reused catalysts. The irreversible conversion of high valence manganese species as well as the reduction of Frenkel-type oxygen vacancies and lattice oxygen could be clearly observed in the reused samples, which were associated with the slight deactivation. Spectators and participators were two existing forms of Frenkel-type oxygen vacancies. It was noteworthy that the participators almost fully regenerated after each reaction cycle, which ensured the ability to activate Olatt in repeated soot oxidation process. Therefore, the catalysts maintained favorable activity and satisfactory durability, which was mainly because the relatively stable level of participators.
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    Journal Title
    Applied Catalysis B: Environmental
    Volume
    223
    DOI
    https://doi.org/10.1016/j.apcatb.2017.08.084
    Subject
    Physical chemistry
    Chemical engineering
    Environmental engineering
    Environmental engineering not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/368934
    Collection
    • Journal articles

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