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首页> 外文期刊>Environmental Science & Technology >Design Strategies for Development of SCR Catalyst: Improvement of Alkali Poisoning Resistance and Novel Regeneration Method
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Design Strategies for Development of SCR Catalyst: Improvement of Alkali Poisoning Resistance and Novel Regeneration Method

机译：SCR催化剂开发的设计策略：耐碱中毒的改进和新的再生方法

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摘要

Based on the ideas of the additives modification and regeneration method update, two different strategies were designed to deal with the traditional SCR catalyst poisoned by alkali metals. First, ceria doping on the V_2O_5-WO_3/TiO_2 catalyst could promote the SCR performance even reducing the V loading, which resulted in the enhancement of the catalyst's alkali poisoning resistance. Then, a novel method, electrophoresis treatment, was employed to regenerate the alkali poisoned V_2O_5-WO_3/TiOj catalyst. This novel technique could dramatically enhance the SCR activities of the alkali poisoned catalysts by removing approximately 95% K or Na ions from the catalyst and showed less hazardous to the environment Finally, the deactivation mechanisms by the alkali metals were extensively studied by employing both the experimental and DFT theoretical approaches. Alkali atom mainly influences the active site V species rather than W oxides. The decrease of catalyst surface acidity might directly reduce the catalytic activity, while the reducibility of catalysts could be another important factor.
机译：基于添加剂改性和再生方法更新的思想，设计了两种不同的策略来处理传统的碱金属中毒的SCR催化剂。首先，二氧化铈掺杂在V_2O_5-WO_3 / TiO_2催化剂上可以提高SCR性能，甚至降低V的负载量，从而提高了催化剂的耐碱中毒性。然后，采用一种新的方法，即电泳处理，再生了碱中毒的V_2O_5-WO_3 / TiOj催化剂。通过从催化剂中去除大约95％的K或Na离子，该新技术可以显着增强碱中毒催化剂的SCR活性，并且对环境的危害较小。最后，通过同时使用两种实验方法对碱金属的失活机理进行了广泛的研究。和DFT理论方法。碱原子主要影响活性位点的V物种，而不是W氧化物。催化剂表面酸度的降低可能直接降低催化活性，而催化剂的还原性可能是另一个重要因素。

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  • 来源
    《Environmental Science & Technology》 |2012年第22期|12623-12629|共7页
  • 作者

    Yue Peng; Junhua Li; Wenbo Shi; Jiayu Xu; Jiming Hao;

  • 作者单位

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, 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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  • 正文语种 eng
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