吸附还原降低柴油机NO_x和PM的微观反应动力学计算

Micro-reaction Kinetics Calculation for Reducing Diesel NO_x and PM by Adsorber-reduction Catalyst

以BaO(s1)为第1吸附位,Pt(s2)为第2吸附位,采用Chekmin软件对吸附还原脱除柴油机NOx和PM的微观反应动力学过程进行了模拟计算,结果表明:稀燃阶段气相NO(g)、NO2(g)以NO2(s1)、NO2NO3(s1)、NO3(s1)形式储存在BaO表面;浓燃阶段NOx中的N原子相互结合,形成的N2分子被脱附,C(S)与活性氧O*进行表面反应。稀燃运行时间和比值大小、发动机排温及排气中氧浓度对NOx和PM的去除有较大影响。

BaO（s1） was used as the first adsorption sites,and Pt（s2） was used as the second adsorption site,the micro-reaction kinetics simulation of NOx and PM in diesel engine by adsorber-reduction catalyst was calculated with the software of Chekmin.The results showed that in lean burn condition,gas phase NO（g）,NO2（g） were stored in forms of NO2（s1）,NO2NO3（s1）,and NO3（s1） on the surface of BaO,but in rich burn condition,N atoms in NOx desorption from surface of BaO combined with each other to form N2 molecular.Surface reaction was occurred between C（S） and reactive oxygen species O＊.The absolute time,the ratio values of lean burn condition,exhaust temperature and oxygen concentration in diesel engine exhaust pipe have a great impact on removal of NOx and PM emission.