Hunan Provincial Key Laboratory of Vehicle Power and Transmission System, Hunan Institute of Engineering, Xiangtan, 411104, China.
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China.
Environ Sci Pollut Res Int. 2021 Apr;28(16):20034-20044. doi: 10.1007/s11356-020-11870-1. Epub 2021 Jan 6.
The high NO/NO ratio in the after-treatment system is beneficial to its performance and achieved by NO catalytic conversion in diesel oxidation catalyst (DOC) located upstream (CRDPF), catalytic DPF (CDPF), or a combination of both (CCDPF). In order to effectively control the emission of particulates and nitrogen oxides, various types of diesel particulate filter models are established to compare NO catalytic formation, consumption, and efflux. The results show that the catalytic performance of NO conversion is limited by mass transfer in DOC catalytic coating, while it is almost non-existent in CDPF. At low temperature, the passive regeneration of CDPF is slower than that of CRDPF, but as the temperature increases, the passive regeneration speed of CDPF will exceed that of CRDPF. CCDPF is the most effective for the NO catalytic formation, consumption, and efflux in the hot-start and high-speed cycle and thereby is conducive to improve the performance of the diesel particulate filter and downstream selective catalytic reduction.
后处理系统中的高 NO/NO 比有利于其性能，并通过位于上游（CRDPF）的 NO 催化转化、柴油氧化催化剂（DOC）、催化 DPF（CDPF）或两者的组合（CCDPF）来实现。为了有效控制颗粒物和氮氧化物的排放，建立了各种类型的柴油颗粒过滤器模型来比较 NO 催化形成、消耗和流出。结果表明，NO 转化的催化性能受到 DOC 催化涂层中质量传递的限制，而在 CDPF 中几乎不存在。在低温下，CDPF 的被动再生比 CRDPF 慢，但随着温度的升高，CDPF 的被动再生速度将超过 CRDPF。CCDPF 对热启动和高速循环中的 NO 催化形成、消耗和流出最有效，从而有利于提高柴油颗粒过滤器和下游选择性催化还原的性能。
