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首页> 外文期刊>Environmental Science & Technology >Improved NO_x Reduction in the Presence of SO_2 by Using Fe_2O_3-Promoted Halloysite-Supported CeO_2-WO_3 Catalysts
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Improved NO_x Reduction in the Presence of SO_2 by Using Fe_2O_3-Promoted Halloysite-Supported CeO_2-WO_3 Catalysts

机译：Fe_2O_3-促进的埃洛石负载的CeO_2-WO_3催化剂提高了SO_2中NO_x的还原率

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摘要

Currently, selective catalytic reduction (SCR) of NOx with NH3 in the presence of SO2 by using vanadium-free catalysts is still an important issue for the removal of NOx for stationary sources. Developing high-performance catalysts for NOx reduction in the presence of SO2 is a significant challenge. In this work, a series of Fe2O3-promoted halloysite-supported CeO2-WO3 catalysts were synthesized by a molten salt treatment followed by the impregnation method and demonstrated improved NOx reduction in the presence of SO2. The obtained catalyst exhibits superior catalytic activity, high N-2 selectivity over a wide temperature range from 270 to 420 degrees C, and excellent sulfur-poisoning resistance. It has been demonstrated that the Fe2O3-promoted halloysite-supported CeO2-WO3 catalyst increased the ratio of Ce3+ and the amount of surface oxygen vacancies and enhanced the interaction between active components. Moreover, the SCR reaction mechanism of the obtained catalyst was studied using in situ diffuse reflectance infrared Fourier transform spectroscopy. It can be inferred that the number of Bronsted acid sites is significantly increased, and more active species could be produced by Fe2O3 promotion. Furthermore, in the presence of SO2, the Fe2O3-promoted halloysite-supported CeO2-WO3 catalyst can effectively prevent the irreversible bonding of SO2 with the active components, making the catalyst exhibit desirable sulfur resistance. The work paves the way for the development of high-performance SCR catalysts with improved NOx reduction in the presence of SO2.
机译：目前，通过使用无钒催化剂在SO2存在下用NH3用NH3选择性催化还原（SCR）仍然是去除固定源NOx的重要问题。开发用于在SO2存在下还原NOx的高性能催化剂是一项重大挑战。在这项工作中，通过熔融盐处理，然后采用浸渍法合成了一系列Fe2O3促进的埃洛石负载的CeO2-WO3催化剂，并证明了在SO2存在下NOx的还原性得到了改善。所获得的催化剂表现出优异的催化活性，在从270至420℃的宽温度范围内的高N-2选择性和优异的抗硫中毒性。已经证明，Fe 2 O 3促进的埃洛石负载的CeO 2 -WO 3催化剂增加了Ce 3+的比例和表面氧空位的数量，并增强了活性成分之间的相互作用。此外，使用原位漫反射红外傅里叶变换光谱法研究了所得催化剂的SCR反应机理。可以推断出布朗斯台德酸位点的数量显着增加，并且通过促进Fe 2 O 3可以产生更多的活性物种。此外，在SO 2的存在下，Fe 2 O 3促进的埃洛石负载的CeO 2 -WO 3催化剂可以有效地防止SO 2与活性成分的不可逆结合，从而使催化剂表现出期望的耐硫性。这项工作为开发高性能的SCR催化剂铺平了道路，该催化剂在SO2存在下具有改善的NOx还原能力。

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  • 来源
    《Environmental Science & Technology》 |2019年第2期|938-945|共8页
  • 作者

    Kang Lin; Han Lupeng; He Jiebing; Li Hongrui; Yan Tingting; Chen Guorong; Zhang Jianping; Shi Liyi; Zhang Dengsong;

  • 作者单位

    Shanghai Univ, Dept Chem, Coll Sci, Res Ctr Nano Sci & Technol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Dept Chem, Coll Sci, Res Ctr Nano Sci & Technol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Dept Chem, Coll Sci, Res Ctr Nano Sci & Technol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Dept Chem, Coll Sci, Res Ctr Nano Sci & Technol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Dept Chem, Coll Sci, Res Ctr Nano Sci & Technol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Dept Chem, Coll Sci, Res Ctr Nano Sci & Technol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Dept Chem, Coll Sci, Res Ctr Nano Sci & Technol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Dept Chem, Coll Sci, Res Ctr Nano Sci & Technol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Dept Chem, Coll Sci, Res Ctr Nano Sci & Technol, Shanghai 200444, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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