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首页> 外文期刊>Environmental Science & Technology >Distinct NO_2 Effects on Cu-SSZ-13 and Cu-SSZ-39 in the Selective Catalytic Reduction of NO_x with NH_3
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Distinct NO_2 Effects on Cu-SSZ-13 and Cu-SSZ-39 in the Selective Catalytic Reduction of NO_x with NH_3

机译：不同的NO_2对Cu-SSZ-13和Cu-SSZ-39的选择性催化还原在NH_3的选择性催化还原中的影响

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摘要

Cu-SSZ-13 and Cu-SSZ-39, with similar structures, are both highly active and hydrothermally stable in the selective catalytic reduction of NO_x with NH_3 (NH_3-SCR), attracting great attention for applications on diesel vehicles. In this study, it was interestingly found that NO_2 has distinct effects on the NO_x conversion over Cu-SSZ-13 and Cu-SSZ-39, with an inhibiting effect for Cu-SSZ-13 but a promoting effect for Cu-SSZ-39. The distinct NO_2 effects were found to be associated with the differences in the reactivity of surface NH_4NO_3, a key intermediate for NH_3-SCR, on these two Cu-based small-pore zeolites. Cu-SSZ-13 has excellent standard SCR activity, but the reactivity of surface NH_4NO_3 with NO is relatively low, which would induce the accumulation of NH_4NO_3 on the surface and thus inhibit NO_x conversion. Surface Bronsted acid sites play key roles in the reduction of surface NH_4NO_3 by NO, and Cu-SSZ-39 showed much higher surface acidity than Cu-SSZ-13. Compared with Cu-SSZ-13, the intrinsic standard SCR activity of Cu-SSZ-39 was lower but NH_4NO_3 could be reduced by NO rapidly on Cu-SSZ-39, even faster than the reduction of NO by the adsorbed NH_3 on Cu active sites; thus, NO_x conversion was promoted by NO_2 on Cu-SSZ-39. This work provides an improved understanding of fast SCR on Cu-based small-pore zeolites.
机译：具有相似结构的Cu-SSZ-13和Cu-SSZ-39在用NH_3（NH_3-SCR）的NO_X的选择性催化还原中具有高度活性和水热稳定，吸引柴油车上的应用。在本研究中，有趣的是发现NO_2对Cu-SSZ-13和Cu-SSZ-39的NO_X转化具有明显的影响，具有Cu-SSZ-13的抑制作用，但Cu-SSZ-39的促进效果。发现不同的NO_2效应与表面NH_4NO_3的反应性，NH_3-SCR的关键中间体的反应性的差异有关，在这两种基于Cu的小孔沸石上。 Cu-SSZ-13具有优异的标准SCR活性，但表面NH_4NO_3的反应性相对较低，这将诱导表面上的NH_4NO_3并因此抑制NO_X转换。表面桥接酸部位在否的表面NH_4NO_3的减少中起键角色，CU-SSZ-39显示比Cu-SSZ-13更高的表面酸度。与Cu-SSZ-13相比，Cu-SSZ-39的内在标准SCR活性较低，但NH_4NO_3可以在Cu-SSZ-39上快速降低，甚至比Cu活性的吸附NH_3的无含量的减少更快网站;因此，在Cu-SSZ-39上通过NO_2促进NO_X转换。这项工作提高了对Cu基小孔沸石的快速SCR的了解。

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  • 来源
    《Environmental Science & Technology》 |2020年第23期|15499-15506|共8页
  • 作者

    Na Zhu; Yulong Shan; Wenpo Shan; Yu Sun; Kuo Liu; Yan Zhang; Hong He;

  • 作者单位

    Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China;

    Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Chinese Academy of Sciences Ningbo 315800 China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China;

    Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Chinese Academy of Sciences Ningbo 315800 China;

    Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 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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