摘要
Me/SAPO-34(Me=Mn,Ni,Co)series of catalysts were prepared by a wetness impregnation method and investigated for the selective catalytic reduction of nitrogen oxides with ammonia(NH 3-SCR).Among them,Mn/SAPO-34 catalyst was found as the most promising candidate based on its superior low-temperature activity.The catalysts were characterized by X-ray diffraction(XRD),transmission electron microscopy images(TEM),nuclear magnetic resonance(NMR),X-ray photoelectron spectroscopy(XPS),temperature programmed reduction and desorption(TPR and TPD),and diffuse reflectance infrared Fourier transformed spectroscopy(DRIFTS)of NH_(3)/NO_(x)adsorption.Mn/SAPO-34 is obviously different from Ni/SAPO-34 and Co/SAPO-34 in the active species state and distribution.Surface MnO_(x)species which play an essential role in NO oxidation and NO_(2)adsorption,act as better active sites than nickel and cobalt mostly in the form of the aluminates and silicates.
基金
supported by the National Natural Science Foundation of China(No.51702215)
the Science and Technology Department of Zhejiang Province(Nos.LGG19B070002,2020C01134)
the Science and Technology Program of Shaoxing(No.2017B70051)
Shaoxing University(No.2016LG1001)
National Training Programs of Innovation and Entrepreneurship for Undergraduates(No.202010349023)
the Key Innovation Project of Qinghai Provincial Science and Technology Department(No.2016-GX-116)
the National Key R&D Program of China(No.2017YFC0211202)。
