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首页> 外文期刊>Chemicke Zvesti >Comparative study of Co/TiO2, Co-Mn/TiO2 and Co-Mn/Ti-Ce catalysts for oxidation of elemental mercury in flue gas
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Comparative study of Co/TiO2, Co-Mn/TiO2 and Co-Mn/Ti-Ce catalysts for oxidation of elemental mercury in flue gas

机译：Co / TiO2，Co-Mn / TiO2和Co-Mn / Ti-Ce催化剂对烟道气中元素汞氧化的对比研究

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摘要

The Co-Mn/Ti-Ce catalyst prepared by sol-gel and impregnation method was evaluated for catalytic oxidation of Hg-0 in the simulated flue gas compared with Co/TiO2 and Co-Mn/TiO2. The results showed that Co-Mn/Ti-Ce catalyst exhibited higher catalytic activity (around 93% Hg-0 removal efficiency in the temperature of 150 A degrees C with 6% O-2, 400 ppm NO, 200 ppm SO2 and 3% H2O) than Co/TiO2 and Co-Mn/TiO2. Based on the characterization results of N-2 adsorption-desorption, XRD, UV-Vis, XPS, H-2-TPR and Hg-TPD, it could be concluded that the lower band gap, better reducibility and mercury adsorption capability and the presence of Co3+/Co2+, Mn4+/Mn3+ and Ce4+/Ce3+ redox couples as well as surface oxygen species contributed to the excellent Hg-0 oxidation removal performance. In addition, well dispersion of active components and a synergetic effect among Co, Mn and Ce species might improve the activity further. A Mars-Maessen mechanism is thought to be involved in the Hg-0 oxidation. The lattice oxygen derived from MnO (x) or CoO (x) would react with adsorbed Hg-0 to form HgO and the consumption of lattice oxygen could be replenished by O-2. For Co-Mn/Ti-Ce, MnO (x-1) could be alternatively reoxidized by the lattice oxygen derived from adjacent CoO (x) and CeO (x) which is beneficial to the Hg-0 oxidation.
机译：通过溶胶 - 凝胶和浸渍方法制备的Co-Mn / Ti-Ce催化剂，与CO / TiO 2和Co-Mn / TiO 2相比，在模拟烟道气中进行催化氧化Hg-0。结果表明，CO-Mn / Ti-Ce催化剂具有更高的催化活性（在150℃的温度下约93％HG-0除去效率，6％O-2，400ppm NO，200ppm SO2和3％ H2O）比CO / TiO2和CO-Mn / TiO2。基于N-2吸附 - 解吸，XRD，UV-Vis，XPS，H-2-TPR和HG-TPD的表征结果，可以得出结论，较低的带隙，更好的还原性和汞吸附能力和存在CO 3 + / CO2 +，MN4 + / MN3 +和CE4 + / CE3 +氧化还原伴侣以及表面氧气物质有助于优异的HG-0氧化去除性能。此外，良好的活性组分和CO，Mn和Ce物种之间的良好分散性和协同作用可能进一步改善活性。 MARS-Maessen机制被认为参与HG-0氧化。衍生自MnO（X）或CoO（X）的晶格氧将与吸附的HG-0反应形成HGO，可以通过O-2补充晶格氧的消耗。对于Co-Mn / Ti-Ce，MnO（X-1）可以通过衍生自相邻的CoO（X）和CeO（X）的晶格氧来再氧化，这对HG-0氧化有益。

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  • 来源
    《Chemicke Zvesti》 |2017年第9期|共10页
  • 作者

    Li Honghu; Wang Shengkai; Wang Xu; Tang Nian; Pan Siwei; Hu Jiangjun;

  • 作者单位

    Wuhan Univ Sch Resource &

    Environm Sci Wuhan 430079 Hubei Peoples R China;

    Wuhan Univ Sch Resource &

    Environm Sci Wuhan 430079 Hubei Peoples R China;

    Wuhan Univ Sch Resource &

    Environm Sci Wuhan 430079 Hubei Peoples R China;

    Guangdong Power Grid Co Environm Protect Dept Elect Power Res Inst Guangzhou 510080 Guangdong Peoples R China;

    Guangdong Power Grid Co Environm Protect Dept Elect Power Res Inst Guangzhou 510080 Guangdong Peoples R China;

    Wuhan Univ Sch Resource &

    Environm Sci Wuhan 430079 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

    Co-Mn/Ti-Ce catalyst; Elemental mercury; Catalytic oxidation; Characterization;

    机译：Co-Mn / Ti-Ce催化剂;元素汞;催化氧化;表征;

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