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首页> 外文期刊>Environmental Science & Technology >Alkali- and Sulfur-Resistant Tungsten-Based Catalysts for NO_x Emissions Control
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Alkali- and Sulfur-Resistant Tungsten-Based Catalysts for NO_x Emissions Control

机译：耐碱和耐硫的钨基催化剂，用于NO_x排放控制

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摘要

The development of catalysts with simultaneous resistance to alkalis and sulfur poisoning is of great importance for efficiently controlling NO_x emissions using the selective catalytic reduction of NO_x with NH_3 (SCR), because the conventional V_2O_5/WO_3-TiO_2 catalysts often suffer severe deactivation by alkalis. Here, we support V_2O_5 on a hexagonal WO_3 (HWO) to develop a V_2O_5/HWO catalyst, which has exceptional resistance to alkali and sulfur poisoning in the SCR reactions. A 350 μmol g~(-1) K~+ loading and the presence of 1,300 mg m~(-3) SO_2 do not almost influence the SCR activity of the V_2O_5/HWO catalyst, and under the same conditions, the conventional V_2O_5/WO_3-TiO_2 catalysts completely lost the SCR activity within 4 h. The strong resistance to alkali and sulfur poisoning of the V_2O_5/HWO catalysts mainly originates from the hexagonal structure of the HWO. The HWO allows the V_2O_5 to be highly dispersed on the external surfaces for catalyzing the SCR reactions and has the relatively smooth surfaces and the size-suitable tunnels specifically for alkalis' diffusion and trapping. This work provides a useful strategy to develop SCR catalysts with exceptional resistance to alkali and sulfur poisoning for controlling NO_x emissions from the stationary source and the mobile source.
机译：由于常规的V_2O_5 / WO_3-TiO_2催化剂经常遭受碱的严重失活，因此开发出同时具有抗碱和抗硫中毒能力的催化剂对于通过使用NH_3（SCR）选择性催化还原NO_x来有效控制NO_x排放至关重要。在这里，我们在六方WO_3（HWO）上支持V_2O_5以开发V_2O_5 / HWO催化剂，该催化剂对SCR反应中的碱和硫中毒具有出色的抵抗力。 350μmolg〜（-1）K〜+的负载量和1,300 mg m〜（-3）SO_2的存在几乎不会影响V_2O_5 / HWO催化剂的SCR活性，在相同条件下，常规的V_2O_5 / WO_3-TiO_2催化剂在4 h内完全失去了SCR活性。 V_2O_5 / HWO催化剂对碱和硫中毒的强抵抗力主要来自于HWO的六方结构。 HWO使V_2O_5高度分散在外表面上以催化SCR反应，并具有相对光滑的表面和尺寸合适的隧道，专门用于碱的扩散和捕集。这项工作为开发具有优异的抗碱和硫中毒能力的SCR催化剂提供了有用的策略，以控制固定源和移动源的NO_x排放。

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  • 来源
    《Environmental Science & Technology》 |2015年第24期|14460-14465|共6页
  • 作者

    Zhiwei Huang; Hao Li; Jiayi Gao; Xiao Gu; Li Zheng; Pingping Hu; Ying Xin; Junxiao Chen; Yaxin Chen; Zhaoliang Zhang; Jianmin Chen; Xingfu Tang;

  • 作者单位

    Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    School of Chemistry & Chemical Engineering, University of Jinan, Jinan 250022, China;

    Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Department of Applied Physics, Chongqing University, Chongqing 401331, China;

    Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    School of Chemistry & Chemical Engineering, University of Jinan, Jinan 250022, China;

    Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    School of Chemistry & Chemical Engineering, University of Jinan, Jinan 250022, China;

    Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, 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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