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首页> 外文期刊>RSC Advances >Effect of surface species and structure on the performance of CeO2 and SO42- doped MCM-41 catalyst toward NH3-SCR
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Effect of surface species and structure on the performance of CeO2 and SO42- doped MCM-41 catalyst toward NH3-SCR

机译：表面物种和结构对CeO2和SO42-掺杂MCM-41催化剂朝向NH3-SCR的影响

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摘要

The present work elucidated the effects of structures and surface species on the activity of CeO2 and SO42- doped MCM-41 catalysts toward NO reduction by NH3. The results indicated that the sulfated species were generated over Cat-A (Ce(NO3)(3)center dot 6H(2)O and H2SO4 simultaneously doped on MCM-41) and Cat-B (Ce(NO3)(3)center dot 6H(2)O first immersed to MCM-41 and followed by impregnation of H2SO4) except for Cat-C (H2SO4 first doped onto MCM-41 and followed by Ce(NO3)(3)center dot 6H(2)O). The sulfate ion contributed to the formation of Ce3+ concentration, oxygen vacancies, and surface acidity, resulting in improvement of SCR activity. However, the positive influence on SCR activity was overwhelmed by the decomposition of sulfated species. The apparent activation energy of Cat-A (60 kJ mol(-1)) was much lower compared with that of Cat-B and Cat-C (71 and 78 kJ mol(-1), respectively). Pore structures and surface species were responsible for the SCR activity over the CeO2 and SO42- doped MCM-41 catalysts. The best catalytic activity was obtained over Cat-A, followed by Cat-B, and Cat-C exhibited the least catalytic activity.
机译：目前的作品阐明了结构和表面物种对CeO2和SO42-掺杂的MCM-41催化剂的活性对NH 3的不等于NH 3的影响。结果表明，在MCM-41上同时掺杂CAT-A（CE（NO3）（3）中心点6h（2）O和H2SO4）产生硫酸化物质和CAT-B（CE（NO3）（3）中心首先浸入MCM-41的点6H（2）o并随后浸渍H2SO4），除了CAT-C（H 2 SO 4首先掺杂到MCM-41上，然后是Ce（3）（3）中心点6H（2）） 。硫酸根离子有助于形成Ce3 +浓度，氧空位和表面酸度，导致SCR活性的改善。然而，对SCR活性的阳性影响被硫酸化物种的分解所淹没。 CAT-A（60kJMol（-1））的表观活化能量与CAT-B和CAT-C（71和78 kJ摩尔（-1）相比远低得多。孔隙结构和表面物质对CEO2和SO42-掺杂MCM-41催化剂的SCR活性负责。在CAT-A上获得最佳催化活性，然后是CAT-B，CAT-C表现出最催化活性。

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  • 来源
    《RSC Advances》 |2016年第73期|共11页
  • 作者

    Song Zhongxian; Wu Xiang; Zhang Qiulin; Ning Ping; Fan Jie; Liu Xin; Liu Qixian; Huang Zhenzhen;

  • 作者单位

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Peoples R China;

    Yunnan TianAn Chem Co Ltd Anning 650309 Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Peoples R China;

    Hunan Univ Coll Environm Sci &

    Engn Changsha 410082 Hunan Peoples R China;

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