摘要
A series of Fe–Mn catalysts was prepared using different supports(kaolin, diatomite, and alumina) and used for NO abatement via low-temperature NH3-selective catalytic reduction(SCR).The results showed that 12 Fe–10 Mn/Kaolin(with the concentration of Fe and Mn 12 and 10 wt.%, respectively) exhibited the highest activity, and more than 95.8% NO conversion could be obtained within the wide temperature range of 120–300℃.The properties of the catalysts were characterized by inductively coupled plasma-atomic emission spectrometry(ICP-AES), thermogravimetry(TG), Brunner–Emmet–Teller(BET)measurements, X-ray diffraction(XRD), H2-temperature programmed reduction(H2-TPR),NH3-temperature programmed desorption(NH3-TPD), X-ray photoelectron spectroscopy(XPS), scanning electron microprobe(SEM) and energy dispersive spectroscopy(EDS)techniques.The support effects resulted in significant differences in the components and structures of catalysts.The 12 Fe–10 Mn/Kaolin catalyst exhibited better dispersion of active species, optimum low-temperature reduction behavior, the largest amount of normalized Br?nsted acid sites, and the highest Mn4+/Mn and Fe3+/(Fe3++ Fe2+), all of which may be major reasons for its superior catalytic activity.
A series of Fe–Mn catalysts was prepared using different supports（kaolin, diatomite, and alumina） and used for NO abatement via low-temperature NH3-selective catalytic reduction（SCR）.The results showed that 12 Fe–10 Mn/Kaolin（with the concentration of Fe and Mn 12 and 10 wt.%, respectively） exhibited the highest activity, and more than 95.8% NO conversion could be obtained within the wide temperature range of 120–300℃.The properties of the catalysts were characterized by inductively coupled plasma-atomic emission spectrometry（ICP-AES）, thermogravimetry（TG）, Brunner–Emmet–Teller（BET）measurements, X-ray diffraction（XRD）, H2-temperature programmed reduction（H2-TPR）,NH3-temperature programmed desorption（NH3-TPD）, X-ray photoelectron spectroscopy（XPS）, scanning electron microprobe（SEM） and energy dispersive spectroscopy（EDS）techniques.The support effects resulted in significant differences in the components and structures of catalysts.The 12 Fe–10 Mn/Kaolin catalyst exhibited better dispersion of active species, optimum low-temperature reduction behavior, the largest amount of normalized Br?nsted acid sites, and the highest Mn4+/Mn and Fe3+/(Fe3++ Fe2+), all of which may be major reasons for its superior catalytic activity.
基金
supported by the National Natural Science Foundation of China(No.51276039)
a project supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.17KJB610005)
a project funded by Nanjing Xiaozhuang University(No.2016NXY41).
