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改性SCR催化剂对单质汞氧化性能的研究

池桂龙 沈伯雄 朱少文 何川

池桂龙, 沈伯雄, 朱少文, 何川. 改性SCR催化剂对单质汞氧化性能的研究[J]. 燃料化学学报, 2016, 44(6): 763-768.
引用本文: 池桂龙, 沈伯雄, 朱少文, 何川. 改性SCR催化剂对单质汞氧化性能的研究[J]. 燃料化学学报, 2016, 44(6): 763-768.
CHI Gui-long, SHEN Bo-xiong, ZHU Shao-wen, HE Chuan. Oxidation of elemental mercury over modified SCR catalysts[J]. Journal of Fuel Chemistry and Technology, 2016, 44(6): 763-768.
Citation: CHI Gui-long, SHEN Bo-xiong, ZHU Shao-wen, HE Chuan. Oxidation of elemental mercury over modified SCR catalysts[J]. Journal of Fuel Chemistry and Technology, 2016, 44(6): 763-768.

改性SCR催化剂对单质汞氧化性能的研究

基金项目: 

国家自然科学基金 51541602

和河北省自然科学基金 E2016202361

详细信息
  • 中图分类号: X51

Oxidation of elemental mercury over modified SCR catalysts

More Information
  • 摘要: 在模拟SCR反应器烟气组分下, 考察了过渡金属改性掺杂对SCR催化剂单质汞 (Hg0) 氧化性能的影响。采用N2吸附-脱附和X射线衍射 (XRD) 对催化剂理化性能进行表征。结果表明, 金属改性掺杂减小了催化剂的比表面积和总孔容, 但对催化剂的孔径分布没有太大的影响。XRD谱图中出现了微弱的过渡金属氧化物衍射峰。8% Ce/SCR和8% Cu/SCR催化剂表现出了相对稳定和高效的Hg0氧化效率, 而8% Co/SCR催化剂Hg0氧化效率受温度影响较大。金属改性掺杂的催化剂在低NH3和NO烟气组分中表现出较好的Hg0氧化效率, 当烟气组分中存在HCl时, 促进更加明显; 而当催化剂在高NH3和NO烟气组分条件下, 即使有HCl的存在对Hg0氧化效率影响也不大。
  • 图  1  实验流程示意图

    Figure  1  Schematic diagram of the experimental system

    图  2  改性SCR催化剂对Hg0氧化效率的影响

    Figure  2  Hg0 oxidation efficiency over modified SCR catalysts

    (a): condition T1; (b): condition T2

    图  3  HCl存在条件下改性SCR催化剂对Hg0氧化效率的影响

    Figure  3  Hg0 oxidation efficiency over modified SCR catalysts in the presence of HCl

    (a): condition T1+45 mg/m3 HCl; (b): condition T2+45 mg/m3 HCl

    图  4  改性SCR催化剂对脱硝效率的影响

    Figure  4  NO conversion efficiency over modified SCR catalysts

    图  5  催化剂的N2吸附-脱附曲线

    Figure  5  N2 adsorption-desorption curves of catalyst samples

    (a): N2adsorption-desorption isotherms; (b): pore size distributions

    图  6  催化剂的XRD谱图

    Figure  6  XRD patterns of the catalysts

    表  1  测试条件

    Table  1  Test conditions

    Simulated flue gas componentsBalance gasTemperature t/℃
    T15%O2+348mg/m3NH3+613mg/m3NO+1780mg/m3SO2N2300-400
    T25%O2+35mg/m3NH3+61mg/m3NO+1780mg/m3SO2N2300-400
    下载: 导出CSV

    表  2  催化剂的比表面积和孔结构

    Table  2  Specific surface area and pore structure of the catalysts

    CatalystSpecific surface area
    A/(m2·g -1)
    Pore volume
    v/(cm3·g-1)
    Average pore diameter d/nm
    Raw SCR85.80.27711.3
    8% Ce /SCR69.10.21611.1
    8% Cu /SCR59.80.23814.0
    8% Co /SCR67.20.22611.6
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-01-12
  • 修回日期:  2016-03-17
  • 网络出版日期:  2021-01-23
  • 刊出日期:  2016-06-10

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