Citation: YANG Chao, LIU Xiao-Qing, HUANG Bi-Chun, WU You-Ming. Structural Properties and Low-Temperature SCR Activity of Zirconium-Modified MnO_x/MWCNTs Catalysts[J]. Acta Physico-Chimica Sinica, ;2014, 30(10): 1895-1902. doi: 10.3866/PKU.WHXB201407162 shu

Structural Properties and Low-Temperature SCR Activity of Zirconium-Modified MnO_x/MWCNTs Catalysts

1.
1. College of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China;
2. Key Laboratory of the Ministry of Education for Pollution Control and Ecosystem Restoration in Industry Clusters, South China University of Technology, Guangzhou 510006, P. R. China;
3. Guangzhou Research Institute of Environmental Protection, Guangzhou 510620, P. R. China

Received Date: 17 June 2014
Available Online: 16 July 2014
Fund Project:

A series of ZrO₂/MWCNTs were prepared, using ZrO(NO₃)₂·2H₂O as a precursor, by the surface modification of multiwalled carbon nanotubes (MWCNTs). Manganese oxides were supported on the ZrO₂/ MWCNTs to prepare MnO_x/ZrO₂/MWCNTs catalysts. The effect of zirconium on the selective catalytic reduction (SCR) activity of the catalysts was investigated. Furthermore, the structural properties of the catalysts were comprehensively characterized by a suite of analytical methods. The results show that the addition of zirconium improved the SCR activity of the MnO_x/MWCNTs significantly and the catalyst with 30% Zr loading was found to have the highest activity. X- ray powder diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), and N₂ adsorption-desorption results revealed that the modification of zirconium could enhance the dispersion of MnO_x on the support as well as enhance the interaction between the metal oxides and the MWCNTs. Additionally, zirconium could also increase the specific surface area, the total pore volume, and the average pore size of the catalysts. Moreover, from the results of X-ray photoelectron spectroscopy (XPS), H₂ temperature-programmed reduction (H₂-TPR), and temperature-programmed desorption of NH₃ (NH₃- TPD), zirconium increased the atomic concentration of the chemisorbed oxygen on the catalysts surface and promoted the conversion of Mn³⁺ to Mn⁴⁺. Therefore, the surface-active sites increased and the redox ability of the catalysts improved. Additionally, the amount and strength of acid on catalyst surface increased. These factors are the main reason for the MnO_x/ZrO₂/MWCNTs catalysts having better low-temperature SCR activity.
- Selective catalytic reduction,
- Nitrogen oxide,
- Zirconium,
- Manganese oxide,
- Multi-walled carbon nanotube
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Structural Properties and Low-Temperature SCR Activity of Zirconium-Modified MnOx/MWCNTs Catalysts

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通讯作者: 陈斌, bchen63@163.com

Structural Properties and Low-Temperature SCR Activity of Zirconium-Modified MnO_x/MWCNTs Catalysts