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过渡金属元素掺杂改性SCR对零价汞的催化氧化性能

马步宇 黄文君 瞿赞 晏乃强

马步宇, 黄文君, 瞿赞, 晏乃强. 过渡金属元素掺杂改性SCR对零价汞的催化氧化性能[J]. 环境科学研究, 2016, 29(3): 397-403.
引用本文: 马步宇, 黄文君, 瞿赞, 晏乃强. 过渡金属元素掺杂改性SCR对零价汞的催化氧化性能[J]. 环境科学研究, 2016, 29(3): 397-403.
MA Buyu, HUANG Wenjun, QU Zan, YAN Naiqiang. Catalytic Oxidation Performance of SCR Doped with Transition Metal Elements for Removal of Elemental Mercury[J]. Research of Environmental Sciences, 2016, 29(3): 397-403.
Citation: MA Buyu, HUANG Wenjun, QU Zan, YAN Naiqiang. Catalytic Oxidation Performance of SCR Doped with Transition Metal Elements for Removal of Elemental Mercury[J]. Research of Environmental Sciences, 2016, 29(3): 397-403.

过渡金属元素掺杂改性SCR对零价汞的催化氧化性能

基金项目: 国家自然科学基金项目(51278294)

Catalytic Oxidation Performance of SCR Doped with Transition Metal Elements for Removal of Elemental Mercury

  • 摘要: 为提高商用SCR催化剂对Hg0(零价汞)的催化氧化活性,研究了过渡金属对其进行掺杂改性的方法,并利用固定床反应平台考察了不同试验条件下改性催化剂对Hg0的氧化效率. 结果表明:Y、Zn、Ni和Zr等过渡金属的掺杂可明显抑制SCR催化剂的催化活性,而Fe、Cu掺杂改性SCR催化剂对Hg0的催化氧化性能有显著提升. 在反应温度为350 ℃、空速比为370 000 h-1、φ(HCl)为1×10-5的条件下,Fe、Cu掺杂改性的SCR催化剂对Hg0的氧化效率均能达到90%以上,并且Fe掺杂改性后的SCR催化剂的脱硝性能也未受到明显影响. 借助XRD和XPS等表征手段,对反应前后Fe掺杂改性SCR催化剂进行了研究,表明Fe改性SCR催化剂遵循Mars-Maessen和Langmuir-Hinshelwood机制,可明显提高对Hg0的催化氧化效率,因此,应用前景较好.

     

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出版历程
  • 收稿日期:  2015-05-15
  • 修回日期:  2015-11-24
  • 刊出日期:  2016-03-25

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