CDPF贵金属负载量对柴油公交车颗粒PAHS影响

基于装有氧化型催化器（DOC）和催化型颗粒捕集器（CDPF）后处理装置的柴油公交车，在中国典型公交车循环（CCBC）下研究了不同贵金属负载量分别为15g/ft³（A型）、25g/ft³（B型）、35g/ft³（C型）的新鲜及老化的CDPF对柴油发动机颗粒多环芳香烃（PAHs）排放特性的影响.结果表明：新鲜及老化的CDPF均能显著降低颗粒PAHs排放量92%以上.且相比于老化的CDPF，3种新鲜的CDPF降低颗粒PAHs排放的效果相差不大，极差仅为0.009ng/cm².3种CDPF老化状态下降低颗粒PAHs毒性的效果都优于其新鲜状态下，且老化的B型CDPF降低颗粒PAHs总量及毒性的效果优于A型及C型CDPF.

Effect of different metal loads of CDPF on particle PAHs emission from a diesel bus

Based on the diesel bus with oxidized catalyst (DOC) and catalyzed particulate trap(CDPF), an experimental study was conducted, which investigated the impacts of fresh/aged CDPF with different amount precious metal loads of 15g/ft³(type A)、25g/ft³(type B) and 35g/ft³(type C) respectively on characteristics of PAHs from particle emission of diesel engine under China typical city bus driving cycle (CCBC). The results showed that after using fresh and aged CDPF, PAHs emission was reduced significantly, at least by 93%. Compared to aged CDPF, the effect of reducing PAHs emission by all three fresh type CDPF was similar, the extreme difference was only 0.009ng/cm².The effect to reduce toxicity of PHAs emission of all three aged type CDPF were better than when they were fresh. Besides, the effect of reducing PAHs emission and toxicity of aged B type CDPF was better than aged A and C type CDPF.