Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (6): 898-907.DOI: 10.1016/S1872-2067(15)61052-X

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Effects of acid pretreatment on Fe-ZSM-5 and Fe-beta catalysts for N2O decomposition

Minfang Wua,b, Hui Wangb, Liangshu Zhongb, Xinyan Zhangc, Zhengping Haod, Qun Shenb, Wei Weib,e, Guangren Qiana, Yuhan Sunb,e   

  1. a School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;
    b CAS Key Laboratory of Low-Carbon Conversion Science & Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;
    c School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, Jilin, China;
    d Department of Environmental Nano-materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
    e ShanghaiTech University, Shanghai 201210, China
  • Received:2016-01-11 Revised:2016-02-01 Online:2016-05-30 Published:2016-05-30
  • Contact: Qun Shen, Wei Wei
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21307144, 21307007) and Science of Technology Development Plan of Jilin Province of China (20140520150JH).

Abstract:

Two series of ZSM-5 and beta zeolites were pretreated in 1.0 mol/L HNO3 solution at room temperature for various time periods. The catalytic performances of their Fe-exchanged products in N2O decomposition were evaluated. The Fe-zeolite catalysts were characterized using N2 adsorption-desorption, inductively coupled plasma optical emission spectroscopy, X-ray diffraction, ultraviolet-visible spectroscopy, temperature-programmed desorption of NH3, and scanning and transmission electron microscopies. For the ZSM-5 zeolite, acid leaching primarily takes place on the crystal surface and the particle size is reduced, therefore the pore channels are shortened. However, because of the good stability of MFI zeolites, the acid does not greatly penetrate the pore channels and new mesopores are not created. For the beta zeolite, because the amorphous material is inclined to dissolve (deagglomerate), some of the micropores are slightly dilated. The improved catalytic activities can be explained by the increased active Fe loading as a result of structural changes.© 2016, Dalian Institute of Chemical Physics, Chinese Academy of Sciences.

Key words: Iron-containing zeolite, Nitrous oxide, Catalytic performance, Acid leaching, Active site