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    • 1. 发明授权
    • Plasma-assisted catalytic storage reduction system
    • 等离子体辅助催化储存还原系统
    • US06374595B1
    • 2002-04-23
    • US09491234
    • 2000-01-25
    • Bernardino M. PenetranteGeorge E. VogtlinBernard T. MerrittRaymond M. Brusasco
    • Bernardino M. PenetranteGeorge E. VogtlinBernard T. MerrittRaymond M. Brusasco
    • F01N300
    • B01D53/323B01D53/92B01D53/9431B01D53/9454F01N3/01F01N3/0231F01N3/035F01N3/0807F01N3/0892F01N3/2066F01N13/0097F01N2240/28F01N2570/14F01N2610/02F01N2610/03Y02A50/2324Y02A50/2325Y02A50/2344Y02T10/22Y02T10/24
    • A two-stage method for NOx reduction in an oxygen-rich engine exhaust comprises a plasma oxidative stage and a storage reduction stage. The first stage employs a non-thermal plasma treatment of NOx gases in an oxygen-rich exhaust and is intended to convert NO to NO2 in the presence of O2 and hydrocarbons. The second stage employs a lean NOx trap to convert such NO2 to environmentally benign gases that include N2, CO2, and H2O. By preconverting NO to NO2 in the first stage with a plasma, the efficiency of the second stage for NOx reduction is enhanced. For example, an internal combustion engine exhaust is connected by a pipe to a first chamber in which a non-thermal plasma converts NO to NO2 in the presence of O2 and hydrocarbons, such as propene. A flow of such hydrocarbons (CxHy) is input from usually a second pipe into at least a portion of the first chamber. The NO2 from the plasma treatment proceeds to a storage reduction catalyst (lean NOx trap) that converts NO2 to N2, CO2, and H2O, and includes a nitrate-forming catalytic site. The hydrocarbons and NOx are simultaneously reduced while passing through the lean-NOx trap catalyst. The method allows for enhanced NOx reduction in vehicular engine exhausts, particularly those having relatively high sulfur contents.
    • 富氧发动机排气中的NOx还原的两级方法包括等离子体氧化阶段和储存还原阶段。 第一阶段在富氧排气中采用非热等离子体处理NOx气体,旨在在O2和烃存在下将NO转化为NO2。 第二阶段采用贫NOx捕集器将这种NO2转化为包括N 2,CO 2和H 2 O在内的环境良好的气体。 通过在等离子体的第一阶段中将NO转化为NO2,可以提高第二阶段NOx还原效率。 例如,内燃机排气通过管连接到第一室,其中非热等离子体在O 2和烃(如丙烯)存在下将NO转化为NO2。 这种烃(C x H y)的流动通常从第二管道输入至第一室的至少一部分。 来自等离子体处理的NO 2进行到将NO 2转化为N 2,CO 2和H 2 O的储存还原催化剂(贫NOx捕集器),并且包括形成硝酸盐的催化位点。 烃和NOx在通过稀NOx捕集催化剂的同时被同时还原。 该方法允许车辆发动机排气中的NOx减少增加,特别是具有相对较高硫含量的那些。