Abstract
Manganese–copper bimetal oxide catalysts supported on ZSM5 and acid-treated multi-walled carbon nanotubes (MWCNTs) were produced by incipient wetness impregnation for selective catalytic reduction of NO with dielectric barrier discharge plasma. Plasma can activate molecules even at ambient temperature, generating active oxygen species such as O, O3, and HO2 radicals, which can oxidize NO to NO2 effectively. The SCR activity of Mn–Cu/MWCNTs was studied and compared to that of the Mn–Cu/ZSM5. The obtained samples were characterized by XRD, SEM, TEM, ICP, H2-TPR, Raman spectroscopy, and XPS. The results show that Mn–Cu/MWCNTs catalyst possesses NO removal activity superior to that of the Mn–Cu/ZSM5 catalyst. MWCNTs-based catalyst attains NO removal efficiency of 88% at 480 J/L, while the ZSM5-supported catalyst achieves NO removal efficiency of 82% at the same energy density. The oxygen content increased from 3.33 to 19.07% on the nanotube surface after introducing Mn and Cu, which almost remained unchanged on ZSM5. The oxygen-containing functionalities are important for NOx adsorption and removal. Moreover, the characterization revealed that CuO is the main phase of copper oxide, but copper dispersion decreases on Mn–Cu/ZSM5 surface because of the formation of copper dimer species. The manganese is well-dispersed on the catalysts, MnO2 and Mn2O3 contents of Mn–Cu/MWCNTs are larger than that of Mn–Cu/ZSM5, MnO2 is the predominant phase of manganese oxide.
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Acknowledgements
This study was supported by the Fundamental Research Funds for the Central Universities (JB2015RCY06) and Key Projects in the National Science & Technology of China (2015BAA05B02).
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Wang, T., Zhang, X., Liu, H. et al. A Comparison of NO Reduction Over Mn–Cu/ZSM5 and Mn–Cu/MWCNTs Catalysts Assisted by Plasma at Ambient Temperature. Catal Surv Asia 21, 94–102 (2017). https://doi.org/10.1007/s10563-017-9228-z
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DOI: https://doi.org/10.1007/s10563-017-9228-z