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首页> 外文期刊>Environmental Science & Technology >NH_3-SCR Performance of Fresh and Hydrothermally Aged Fe-ZSM-5 in Standard and Fast Selective Catalytic Reduction Reactions
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NH_3-SCR Performance of Fresh and Hydrothermally Aged Fe-ZSM-5 in Standard and Fast Selective Catalytic Reduction Reactions

机译：新鲜和水热老化的Fe-ZSM-5在标准和快速选择性催化还原反应中的NH_3-SCR性能

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摘要

Hydrothermal stability is one of the challenges for the practical application of Fe-ZSM-S catalysts in the selective catalytic reduction (SCR) of NO with NH_3 (NH_3-SCR) for diesel engines. The presence of NO_2 in the exhaust gases can enhance the deNO_x activity because of the fast SCR reaction. In this work, a Fe-ZSM-5 catalyst was prepared by a solid-state ion-exchange method and was hydrothermally deactivated at 800 ℃ in the presence of 10% H_2O. The activity of fresh and hydrothermal aged Fe-ZSM-5 catalysts was investigated in standard SCR (NO_2/NO_x = 0) and in fast SCR with NO_2/NO_x = 0.3 and 0.5. In standard SCR, hydrothermal aging of Fe-ZSM-5 resulted in a significant decrease of low-temperature activity and a slight increase in high-temperature activity. In fast SCR, NO_x conversion over aged Fe-ZSM-5 was significantly increased but was still lower than that over fresh catalyst. Additionally, production of N_2O in fast SCR was much more apparent over aged Fe-ZSM-5 than over fresh catalyst. We propose that, in fast SCR, the rate of key reactions related to NO is slower over aged Fe-ZSM-5 than over fresh catalyst, thus increasing the probabilities of side reactions involving the formation of N_2O.
机译：水热稳定性是Fe-ZSM-S催化剂在柴油机用NH_3（NH_3-SCR）选择性催化还原NO的实际应用中面临的挑战之一。由于快速的SCR反应，废气中NO_2的存在可以增强deNO_x活性。在这项工作中，Fe-ZSM-5催化剂通过固态离子交换方法制备，并在10％H_2O存在下于800℃水热失活。在标准SCR（NO_2 / NO_x = 0）和NO_2 / NO_x = 0.3和0.5的快速SCR中研究了新鲜和水热老化的Fe-ZSM-5催化剂的活性。在标准SCR中，Fe-ZSM-5的水热老化导致低温活性显着降低，而高温活性略有增加。在快速SCR中，老化Fe-ZSM-5的NO_x转化率显着增加，但仍低于新鲜催化剂。此外，在老化的Fe-ZSM-5中，快速SCR中N_2O的产生比新鲜催化剂中的N_2O明显得多。我们建议，在快速SCR中，老化的Fe-ZSM-5上与NO相关的关键反应速率比新鲜催化剂上的慢，从而增加了涉及N_2O形成的副反应的可能性。

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  • 来源
    《Environmental Science & Technology》 |2013年第7期|3293-3298|共6页
  • 作者

    Xiaoyan Shi; Fudong Liu; Lijuan Xie; Wenpo Shan; Hong He;

  • 作者单位

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, 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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