Impacts of continuously regenerating trap and particle oxidation catalyst on the NO2 and particulate matter emissions emitted from diesel engine

• Published in: Journal of environmental sciences (China) Vol. 24; no. 4; pp. 624 - 631
• Main Authors: Liu, Zhihua, Ge, Yunshan, Tan, Jianwei, He, Chao, Shah, Asad Naeem, Ding, Yan, Yu, Linxiao, Zhao, Wei
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.01.2012; Department of Mechanical Engineering, University of Engineering and Technology, Lahore 54000, Pakistan%Chinese Research Academy of Environmental Sciences, Beijing 100012, China; National Lab of Auto Performance and Emission Test, School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China%National Lab of Auto Performance and Emission Test, School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China
• Subjects: Automobiles; Carbon Monoxide - analysis; Catalysis; catalysts; continuously regenerating diesel particulate filter; diesel engine; diesel engines; Gasoline - analysis; Nitrates - analysis; Nitrites - analysis; nitrogen dioxide; Nitrogen Dioxide - analysis; oxidation; Oxidation-Reduction; particle number; Particle Size; particles oxidation catalyst; particulate emissions; Particulate Matter - chemistry; particulates; risk; size distribution; smoke; Vehicle Emissions - analysis; 二氧化氮; 再生; 固体颗粒; 实验室环境; 柴油机排放; 氧化催化剂; 陷阱; 颗粒物排放; continuously regenerating diesel particulate filter; diesel engine; particle number; size distribution; particles oxidation catalyst
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/S1001-0742(11)60810-3

Two continuously regenerating diesel particulate filter （CRDPF） with different configurations and one particles oxidation catalyst （POC） were employed to perform experiments in a controlled laboratory setting to evaluate their effects on NO2, smoke and particle number emissions. The results showed that the application of the after-treatments increased the emission ratios of NO2/NOx significantly. The results of smoke emissions and particle number （PN） emissions indicated that both CRDPFs had sufficient capacity to remove more than 90% of total particulate matter （PM） and more than 97% of solid particles. However, the POC was able to remove the organic components of total PM, and only partially to remove the carbonaceous particles with size less than 30 nm. The negligible effects of POC on larger particles were observed due to its honeycomb structure leads to an inadequate residence time to oxidize the solid particles or trap them. The particles removal efficiencies of CRDPFs had high degree of correlations with the emission ratio of NO2/NOx. The PN emission results from two CRDPFs indicated that more NO2 generating in diesel oxidation catalyst section could obtain the higher removal efficiency of solid particles. However this also increased the risk of NO2 exposure in atmosphere.