Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (05): 555-564. Previous Articles     Next Articles

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  1. (1内蒙古工业大学化工学院 呼和浩特 010062)
    (2内蒙古师范大学化学与环境科学学院 呼和浩特 010022)
    (3内蒙古大学化学与化工学院 呼和浩特 010022)
  • 投稿日期:2010-04-23 修回日期:2010-11-01 发布日期:2010-11-25
  • 通讯作者: 郭金玲
  • 基金资助:


Effect of Cu-Mn-O Structure on the Activity for the Reduction of NO by Propane

Guo Jinling1 Jia Meilin2 Zhaorigetu2 Shen Yuenian*,3   

  1. (1 College of Chemical Engineering, Inner Mongolia University of Technology, Huhhot 010062)
    (2 College of Chemistry & Environmental Science, Inner Mongolia Normal University, Huhhot 010022)
    (3 College of Chemistry & Chemical Engineering, Inner Mongolia University, Huhhot 010022)
  • Received:2010-04-23 Revised:2010-11-01 Published:2010-11-25
  • Contact: Jinling Guo

A series of Cu-Mn-O oxides were prepared by homogeneous precipitation (labeled as U) and hydrothermal method (labeled as H), respectively. The catalysts have been characterized by means of XRD, BET, XPS, and FT-IR analyses. The activity of the catalysts for the reduction of NO with propane was evaluated. The results indicate that the composition of Cu-Mn-O system had dependence on preparation method and calcination temperature, which influenced the catalytic performance for the reduction of NO by propane. In the case of sample from hydrothermal method, Cu1.5Mn1.5O4 and CuMn2O4 were predominant phases with the calcination temperature at range of 500~600 ℃. Then the Cu1.5Mn1.5O4 disappeared as calcination temperature above 700 ℃. As for the samples prepared by urea homogeneous precipitation method, Cu1.5Mn1.5O4 was main phase in all these samples calcined above 500 ℃. Therefore, for hydrothermal method, a phase transition from Cu1.5Mn1.5O4 to CuMn2O4 occurred with the calcination temperature increasing from 600 to 700 ℃. This phase transition not only affected the grain size and specific surface area but also enhanced the catalytic activity in the reduction of NO by C3H8. According to the results of XRD, XPS and the structural character of spinel, the detailed structure formulas for Cu1.5Mn1.5O4 and CuMn2O4 were obtained respectively, and by which the difference of catalytic performance of both spinels could be explained to a certain degree. XRD results demonstrated that the spinel structure of catalysts collapsed with appearance of MnO, CuO and Cu after reaction run over temperature of 600 ℃. It was so surprised that these mixed material possessed good activity for reaction, even higher than the fresh catalysts H-CuMn-700 and U-CuMn-700 in catalytic performance. Furthermore, according to FT-IR spectra, a great deal of (NO2)ad. and small amounts of (NO3)ad adsorbates, that were considered as intermediates, were observed over the catalysts after reaction. This result was in fair agreement with the “synergetic reaction mechanism”.

Key words: reduction of NO by propane, Cu1.5Mn1.5O4, CuMn2O4