Structures and catalytic performances of Me/SAPO-34(Me = Mn,Ni,Co)catalysts for low-tem perature SCR of NOx by ammonia

• 作者: Xuesong Liu Zhiming Sui Hongfeng Chen Yong Chen Haigang Liu Peng Jiang Zhongyun Shen Wensheng Linghu Xiaodong Wu
• 来源期刊: 环境科学学报（英文版）
• 年，卷（期）: 2021,（6）
• 页码范围: 137-149
• 页数: 13页
• 语种: 英文

摘要

Me/SAPO-34(Me = Mn,Ni,Co)series of catalysts were prepared by a wetness impregna-tion method and investigated for the selective catalytic reduction of nitrogen oxides with ammonia(NH3-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 mag-netic resonance(NMR),X-ray photoelectron spectroscopy(XPS),temperature programmed reduction and desorption(TPR and TPD),and diffuse reflectance infrared Fourier trans-formed spectroscopy(DRIFTS)of NH3/NOx adsorption.Mn/SAPO-34 is obviously different from Ni/SAPO-34 and Co/SAPO-34 in the active species state and distribution.Surface MnOx species which play an essential role in NO oxidation and NO2 adsorption,act as better active sites than nickel and cobalt mostly in the form of the aluminates and silicates.