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首页> 外文期刊>Environmental Science & Technology >Using the Novel Method of Nonthermal Plasma To Add Cl Active Sites on Activated Carbon for Removal of Mercury from Flue Gas
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Using the Novel Method of Nonthermal Plasma To Add Cl Active Sites on Activated Carbon for Removal of Mercury from Flue Gas

机译：使用新型非热等离子体方法在活性炭上添加Cl活性位以去除烟气中的汞

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摘要

A new method using nonthermal plasma to add Cl active sites on activated carbon was proposed to improve the efficiency of activated carbon (AC) for removal of mercury from flue gas. The experiments were conducted via a lab-scale dielectric barrier discharge nonthermal plasma system and a vertical adsorption reactor. The results showed that the nonthermal plasma treatment with a small amount of Cl_2 successfully added Cl active sites on AC and greatly increased the mercury removal efficiency of AC by chemisorption in a very short treatment time. The increase in Cl_2 concentration for AC treatment promoted the efficiency of AC. The capacity of mercury adsorption positively correlated with the content of Cl_2 for AC treatment, which depends on the number of Cl active sites on activated carbon. The treated AC maintained a high mercury removal efficiency within a temperature range of 30-210 ℃. SO_2 and H_2O in flue gas inhibited the removal of mercury by AC, while HCl had a promotional effect Scanning electron microscopy and X-ray photoelectron spectroscopy analysis indicated the chemisorption of mercury was attributed to the C-Cl groups generated on AC surfaces during Cl_2 nonthermal plasma treatment. The C-Cl groups as active sites had strong adsorption energy for mercury, which converted elemental mercury to HgCl_2.
机译：提出了一种使用非热等离子体在活性炭上添加Cl活性位点的新方法，以提高活性炭（AC）去除烟道气中汞的效率。通过实验室规模的电介质阻挡层放电非热等离子体系统和垂直吸附反应器进行了实验。结果表明，用少量Cl_2进行的非热等离子体处理成功地在AC上添加了Cl活性位点，并在很短的处理时间内通过化学吸附大大提高了AC的除汞效率。用于AC处理的Cl_2浓度的增加促进了AC的效率。汞吸附的能力与AC处理中Cl_2的含量成正相关，这取决于活性炭上Cl活性位的数量。经过处理的AC在30-210℃的温度范围内保持较高的除汞效率。烟道气中的SO_2和H_2O抑制了AC去除汞，而HCl具有促进作用。扫描电子显微镜和X射线光电子能谱分析表明，汞的化学吸附归因于Cl_2非加热期间AC表面生成的C-Cl基团。等离子处理。 C-Cl基作为活性位对汞具有很强的吸附能，从而将元素汞转化为HgCl_2。

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  • 来源
    《Environmental Science & Technology》 |2016年第21期|11837-11843|共7页
  • 作者

    Bi Zhang; Xiaobo Zeng; Ping Xu; Juan Chen; Yang Xu; Guangqian Luo; Minghou Xu; Hong Yao;

  • 作者单位

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

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