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Structure-performance relationships of MnO2 nanocatalyst for the low-temperature SCR removal of NOX under ammonia

机译：MnO2纳米催化剂在氨下低温SCR去除NOx的结构 - 性能关系

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摘要

To investigate the corresponding relationship between catalytic efficiency and structure, MnO2 nanomaterials (nanospheres, nanosheets, nanorods) have been prepared successfully, and were thoroughly characterized by SEM and TEM. Furthermore, the selective catalytic reduction (SCR) performance of NOX under ammonia was used as an indicative reaction. Among the MnO2 nanomaterials with different morphologies, it was found that their SCR activities showed an interesting variation tendency: nanospheres > nanosheets > nanorods of MnO2. The NO conversion ratio of the MnO2 nanospheres could reach 100% from 200 to 350 degrees C. Moreover, in order to study the probable mechanism for the best removal efficiency of the nanospheres, XRD, H-2-TPR, NH3-TPD, BET, XPS and in situ DRIFTS were performed in detail. It is found that surface chemisorbed oxygen, specific surface area, reducibility and acid sites have great influence on the NO removal efficiency in the SCR reaction. In addition, how several process parameters affect the NOX removal efficiency was carried out, such as time, H2O and SO2.
机译：为了研究催化效率和结构之间的相应关系，成功地制备了MNO2纳米材料（纳米材料，纳米晶片，纳米码），并通过SEM和TEM进行彻底的特征。此外，氨基下NOx的选择性催化还原（SCR）性能用作指示反应。在具有不同形态的MNO2纳米材料中，发现其SCR活动显示出有趣的变异趋势：纳米球>纳米片> MnO 2的纳米棒。 MnO2纳米球的任何转化比率可以从200到350℃达到100％。此外，为了研究纳米球的最佳去除效率，XRD，H-2-TPR，NH3-TPD，BET的可能机制，详细执行XPS和原位漂移。结果发现，表面化学吸附的氧，比表面积，再氧化物和酸部位对SCR反应中的不去除效率有很大影响。此外，执行几种过程参数影响NOx去除效率，例如时间，H2O和SO2。

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  • 来源
    《RSC Advances》 |2016年第60期|共12页
  • 作者

    Li Yi; Li Yanping; Wan Yuan; Zhan Sihui; Guan Qingxin; Tian Yang;

  • 作者单位

    Tianjin Univ Dept Chem Tianjin 300072 Peoples R China;

    Tianjin Univ Dept Chem Tianjin 300072 Peoples R China;

    Tianjin Univ Dept Chem Tianjin 300072 Peoples R China;

    Nankai Univ Coll Environm Sci &

    Engn Tianjin 300071 Peoples R China;

    Nankai Univ Coll Environm Sci &

    Engn Tianjin 300071 Peoples R China;

    Capital Normal Univ Dept Chem Beijing 100048 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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