Abstract:

The behavior of the reactant molecules on carbon materials surface，formation of adsorbed NO₂ ，dimer (NO)₂，—NO₂ or pyridine compounds from single component NO is reviewed. When NO and O₂  coexists，NO is oxidized to NO₂ by the adsorbed O₂. When NO，O₂ and NH₃ coexists，the reaction occurs between adsorbed NH₃ and adsorbed NO₂. The mechanism of selective catalytic reduction（SCR）of NO on activated carbon fibers（ACF）catalyst 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.

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NO₂；NO、O₂和NH₃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 fibers，ACF）催化剂上的选择性催化还原（selective catalytic reduction，SCR）NO的机理为：低温时以NH₃为还原剂的SCR（NH₃-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。