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Mechanism of Hg-0 oxidation in the presence of HCl over a CuCl2-modified SCR catalyst

机译：在CuCl2改性的SCR催化剂上HG-0氧化在HCl存在下的机理

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摘要

CuCl2-SCR catalysts prepared by an improved impregnation method were examined to evaluate the catalytic activity for gaseous elemental mercury (Hg-0) oxidation in the presence of HCl at the typical SCR reaction temperature of 350 degrees C. It was found that Hg-0 oxidation activity of commercial SCR catalyst was significantly improved by the introduction of CuCl2. The X-ray fluorescence and Hg-0 temperature-programmed desorption (Hg-0-TPD) methods were employed to characterize the catalysts. The results indicated that CuCl2 on CuCl2-SCR catalyst could release active Cl species in the presence of O-2 at 350 degrees C, and the released active Cl species could be replenished in the presence of gas-phase HCl. CuCl2-SCR catalyst possessed the appropriate active sites for the adsorption of NH3 and HCl, which could scavenge the inhibiting effect of NH3 on Hg-0 oxidation. Hg-0-TPD results suggested that the oxidized mercury compounds mainly exited as HgCl2 once HCl was present. The Hg-0 oxidation mechanism over CuCl2-SCR catalyst in the presence of HCl could be explained as follows: The adsorbed Hg-0 reacted with active Cl species released by CuCl2 to form HgCl2. The reduced CuCl was re-chlorinated to CuCl2 via the intermediate copper oxychloride (Cu2OCl2) formation by being exposed to the gas-phase HCl.
机译：通过改进的浸渍方法制备的CuCl2-SCR催化剂在HCl在典型的SCR反应温度为350℃的情况下，评估气态元素汞（HG-0）氧化的催化活性。结果发现HG-0通过引入CuCl 2显着改善了商业SCR催化剂的氧化活性。使用X射线荧光和HG-0温度编程的解吸（HG-0-TPD）方法表征催化剂。结果表明，CuCl2-SCR催化剂的CuCl2可以在350℃下在O-2存在下释放活性Cl种，并且可以在气相HCl存在下补充释放的活性Cl物种。 CuCl2-SCR催化剂具有用于吸附NH 3和HCl的适当活性位点，这可以清除NH 3对Hg-0氧化的抑制作用。 HG-0-TPD结果表明，存在一旦HCl，主要被退出的氧化汞化合物存在。在HCl存在下，HG-0氧化机理在HCl存在下可以如下所述：吸附的Hg-0与CuCl 2释放的活性Cl物种反应以形成HgCl 2。通过暴露于气相HCl，通过中间氧化铜（Cu2ocl2）形成将还原的CuCl通过中间氧化铜（Cu2ocl2）形成。

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  • 来源
    《Journal of Materials Science》 |2018年第14期|共12页
  • 作者

    Chen Chuanmin; Jia Wenbo; Liu Songtao; Cao Yue;

  • 作者单位

    North China Elect Power Univ Dept Environm Sci &

    Engn Baoding 071003 Hebei Peoples R China;

    North China Elect Power Univ Dept Environm Sci &

    Engn Baoding 071003 Hebei Peoples R China;

    North China Elect Power Univ Dept Environm Sci &

    Engn Baoding 071003 Hebei Peoples R China;

    North China Elect Power Univ Dept Environm Sci &

    Engn Baoding 071003 Hebei Peoples R China;

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  • 正文语种 eng
  • 中图分类 工程材料学;
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