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Effects of Catalyst Structural Parameters on the Performance of Exhaust Gas Aftertreatment System of Diesel Engines


To meet increasingly stringent emission regulations, diesel engines must be equipped with DOC, DPF and SCR. Five performance parameters including system back pressure, HC conversion efficiency, conversion efficiency of NO to NO2, passive regeneration rate, and conversion efficiency of NO to N2 are very important for DOC+DPF+SCR system. Nine structural parameters including rDOC, rDPF, rSCR, σDOC, σDPF, σSCR, δDOC, δDPF, and δSCR directly affect the five performance parameters, this paper has carried out a detailed study on it. First, a simulation model of DOC+DPF+SCR system was established, and calibrated by experiment. Then, simulation was performed on the five performance parameters under different values of the nine structural parameters. Subsequently, a novel model using random forest algorithm was established to analyze the correlation between the performance parameters and the structural parameters. The results show that σDPF has the greatest influence on system backpressure, followed by rDPF. The rDOC has the greatest influence on HC conversion, followed by σDOC. The rDOC has the greatest influence on conversion of NO to NO2, followed by σDOC. The rDPF has the greatest influence on DPF passive regeneration rate, followed by rDOC. The rSCR has the greatest influence on conversion of NO to N2, followed by rDOC.

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diesel oxidation catalyst


diesel particulate filter


selective catalytic reduction




nitric oxide

NO2 :

nitrogen dioxide

N2 :


r DOC :

length-to-diameter ratio of DOC

r DPF :

length-to-diameter ratio of DPF

r SCR :

length-to-diameter ratio of SCR

σ DOC :

cell density of DOC

σ DPF :

celldensity of DPF

σ SCR :

cell density of SCR

δ DOC :

wall thickness of DOC

δ DPF :

wall thickness of DPF

δ SCR :

wall thickness of SCR


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This work was supported by the National Natural Science Foundation of China [52076154]; the National Key R&D Program of China [2017YFC0211202]; and the Prospective study funding of Nanchang Automotive Innovation Institute [QZKT 2020–07]. The authors would like to thank the editors and anonymous reviewers for their suggestions to improve the paper.

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Correspondence to Tan Pi Qiang.

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Qiang, T.P., Peng, L.Y., De Yuan, W. et al. Effects of Catalyst Structural Parameters on the Performance of Exhaust Gas Aftertreatment System of Diesel Engines. Int.J Automot. Technol. 23, 1085–1097 (2022).

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