Distinct NO2 Effects on Cu-SSZ-13 and Cu-SSZ-39 in the Selective Catalytic Reduction of NOx with NH3

Na  Zhu; Yulong  Shan; Wenpo  ShanYu  SunKuo  LiuYan  ZhangHong  He

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Distinct NO2 Effects on Cu-SSZ-13 and Cu-SSZ-39 in the Selective Catalytic Reduction of NOx with NH3

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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_(4)NO_(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_(4)NO_(3) with NO is relatively low, which would induce the accumulation of NH_(4)NO_(3) on the surface and thus inhibit NO_(x ) conversion. Surface Brønsted acid sites play key roles in the reduction of surface NH_(4)NO_(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_(4)NO_(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.

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《Environmental Science & Technology: ES&T》 |2020年第23期|15499-15506|共8页
作者
Na Zhu; Yulong Shan; Wenpo ShanYu SunKuo LiuYan ZhangHong He;
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作者单位

University of Chinese Academy of Sciences;

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

Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences;

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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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正文语种英语
中图分类环境科学、安全科学;
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Distinct NO2 Effects on Cu-SSZ-13 and Cu-SSZ-39 in the Selective Catalytic Reduction of NOx with NH3

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