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Effect of catalyzed diesel particulate filter and its catalyst loading on emission characteristics of a non-road diesel engine

查看全文 作　　者：Yunhua [1]Zhang;Diming [1]Lou;Piqiang [1]Tan;Zhiyuan [1]Hu;Liang [1]Fang 高影响力作者 机构地区：[1]School of Automotive studies,Tongji University,Shanghai 201804,China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2023年第4期,共12页高影响力期刊 基　　金：sponsored by the National Engineering Laboratory for Mobile Source Emission Control Technology (No. NELMS2020A02);Shanghai Sailing Program (No. 21YF1448900)。 摘　　要：In this study, the effects of a diesel oxidation catalyst(DOC) coupled with a catalyzed diesel particulate filter(CDPF) with different catalyst loadings on the power, fuel consumption,gaseous and particulate emissions from a non-road diesel engine were investigated. Results showed that the after-treatment had a negligible effect on the power and fuel consumption.The reduction effect of the DOC on the CO and hydrocarbon(HC) increased with the engine load. Further reductions occurred coupling with the CDPF. Increasing the catalyst loading resulted in a more significant reduction in the HC emissions than CO emissions. The DOC could increase the NO_(2)proportion to 37.9%, and more NO_(2)was produced when coupled with the CDPF below 250℃;above 250℃, more NO_(2)was consumed. The after-treatment could reduce more than 99% of the particle number(PN) and 98% of the particle mass(PM).Further reductions in the PN and PM occurred with a higher CDPF catalyst loading. The DOC had a better reduction effect on the nucleation particles than the accumulation ones, but the trend reversed with the CDPF. The DOC shifted the particle size distribution(PSD) to larger particles with an accumulation particle proportion increasing from 13% to 20%, and the geometric mean diameter(GMD) increased from 18.2 to 26.0 nm. The trend reversed with the CDPF and the accumulation particle proportion declined to less than 10%. A lower catalyst loading on the CDPF led to a higher proportion of nucleation particles and a smaller GMD. 关 键 词：Catalyzed diesel particulate filter Catalyst loading EMISSIONS Particle size distribution Geometric mean diameter
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