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为去除柴油机尾气中的氮氧化物(nitrogen oxide,NOx),设计了一套基于介质阻挡放电形式的非热等离子体(non-thermal plasma,NTP)反应器。通过改变放电电压及模拟气体组分,考察了NTP对NOx的还原效果以及对BaO/Al2O3催化剂储存NOx的促进作用。结果表明,NTP直接还原NOx效率不高,但可将NO氧化成NO2;从NO向NO2的转化率随放电电压及含氧量的升高而增加;加入丙烯能提高直接净化NOx的效率;由于NTP的协同,催化剂的NOx储存能力在300℃下提高了68%。
In order to remove nitrogen oxide (NOx) from diesel exhaust, a non-thermal plasma (NTP) reactor based on dielectric barrier discharge was designed. By changing the discharge voltage and simulated gas composition, the reduction effect of NTP on NOx and the promotion of NOx storage on BaO / Al2O3 catalyst were investigated. The results showed that NTP was not efficient for direct reduction of NOx but could oxidize NO to NO2; the conversion from NO to NO2 increased with the increase of discharge voltage and oxygen content; the addition of propylene increased the efficiency of direct purification of NOx; NTP, the NOx storage capacity of the catalyst increased by 68% at 300 ° C.