化工进展

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活性碳纤维低温选择性催化还原NO的机理研究进展

黄 华 存   

  1. 河池学院化学与生命科学系,广西 宜州 546300
  • 出版日期:2011-07-05 发布日期:2011-07-05

Research advance in mechanism of low-temperature SCR of NO on carbon materials

HUANG Huacun   

  1. Department of Chemistry and Life Science,Hechi College,Yizhou 546300,Guangxi,China
  • Online:2011-07-05 Published:2011-07-05

摘要:

简述了不同反应物组合在碳材料表面的行为特征,单组分NO可以形成吸附态的NO2、二聚体(NO)2、—NO2或吡啶类的化合物;O2存在时NO被吸附态的氧氧化成NO2NOO2NH3同时存在时,反应发生在吸附态的NH3和吸附态的NO2之间。着重详述了活性碳纤维(activated carbon fibersACF)催化剂上的选择性催化还原(selective catalytic reductionSCRNO的机理为:低温时以NH3为还原剂的SCRNH3-SCR遵循Langmuir-Hinshelwood机理,较高温度时NH3-SCR 遵循Eley-Rideal机理;分析指出了催化剂孔结构特征和表面化学官能团是ACF能低温选择性催化还原NO的主要影响因素。

Abstract:

The behavior of the reactant molecules on carbon materials surfaceformation of adsorbed NO2 dimer (NO)2,—NO2 or pyridine compounds from single component NO is reviewed. When NO and O2  coexistsNO is oxidized to NO2 by the adsorbed O2. When NOO2 and NH3 coexiststhe reaction occurs between adsorbed NH3 and adsorbed NO2. The mechanism of selective catalytic reductionSCRof NO on activated carbon fibersACFcatalyst is presented as follows. At a low temperature NH3-SCR follows the Langmuir-Hinshelwood mechanism. While at a high temperature NH3-SCR follows the Eley-Rideal mechanism. The catalyst pore structure characteristics and surface chemical functional groups are the main factors of the low temperature SCR of NO.

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