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  • Insights into the surface-defect dependence of molecular oxygen activation over birnessite-type MnO2

    Author(s)
    Yang, W
    Zhu, Y
    You, F
    Yan, L
    Ma, Y
    Lu, C
    Gao, P
    Hao, Q
    Li, W
    Griffith University Author(s)
    Hao, Derek
    Year published
    2018
    Metadata
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    Abstract
    In establishing the kinetics, energetics and mechanisms of phenolic degradation reactivity, active reactive oxygen species (ROS) on catalysts surface could exert a vital part. This paper attempts to account for different ROS at the atomic level using octahedral layered birnessite-type MnO2 as a platform with different crystal planes which could induce the Jahn-Teller effect and further realize deep mineralization of phenolic pollutants at low temperature. The catalytic degradation phenol rate of (100) MnO2 is 3 times as much as that of (001) MnO2, and the activation energy of the catalytic reaction is reduced by 11 KJ/mol. ...
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    In establishing the kinetics, energetics and mechanisms of phenolic degradation reactivity, active reactive oxygen species (ROS) on catalysts surface could exert a vital part. This paper attempts to account for different ROS at the atomic level using octahedral layered birnessite-type MnO2 as a platform with different crystal planes which could induce the Jahn-Teller effect and further realize deep mineralization of phenolic pollutants at low temperature. The catalytic degradation phenol rate of (100) MnO2 is 3 times as much as that of (001) MnO2, and the activation energy of the catalytic reaction is reduced by 11 KJ/mol. The degradation content of (100) MnO2 surpasses 30% than that of (001) MnO2. Both spin-trapping EPR and DFT results show superoxide ([rad]O2−) species could exist on (001) MnO2 through one electron transfer, while the peroxide (O22−) species exist on (100) MnO2 via two electrons transfer. All the results illustrate that birnessite MnO2 possesses surface-dependent molecular oxygen activation properties.
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    Journal Title
    Applied Catalysis B: Environmental
    Volume
    233
    DOI
    https://doi.org/10.1016/j.apcatb.2018.03.107
    Subject
    Physical chemistry
    Chemical engineering
    Environmental engineering
    Publication URI
    http://hdl.handle.net/10072/412066
    Collection
    • Journal articles

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