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Frontiers of Environmental Science & Engineering

Front Envir Sci Eng    2012, Vol. 6 Issue (4) : 463-469
Effects of a diesel oxidation catalyst on gaseous pollutants and fine particles from an engine operating on diesel and biodiesel
Xiaoyan SHI1,2, Kebin HE1(), Weiwei SONG1, Xingtong WANG1, Jihua TAN1
1. School of Environment, Tsinghua University, Beijing 100084, China; 2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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The effects of a diesel oxidation catalytic (DOC) converter on diesel engine emissions were investigated on a diesel bench at various loads for two steady-state speeds using diesel fuel and B20. The DOC was very effective in hydrocarbon (HC) and CO oxidation. Approximately 90%–95% reduction in CO and 36%–70% reduction in HC were realized using the DOC. Special attention was focused on the effects of the DOC on elemental carbon (EC) and organic carbon (OC) fractions in fine particles (PM2.5) emitted from the diesel engine. The carbonaceous compositions of PM2.5 were analyzed by the method of thermal/optical reflectance (TOR). The results showed that total carbon (TC), OC and EC emissions for PM2.5 from diesel fuel were generally reduced by the DOC. For diesel fuel, TC emissions decreased 22%–32% after the DOC depending on operating modes. The decrease in TC was attributed to 35%–97% decrease in OC and 3%–65% decrease in EC emissions. At low load, a significant increase in the OC/EC ratio of PM2.5 was observed after the DOC. The effect of the DOC on the carbonaceous compositions in PM2.5 from B20 showed different trends compared to diesel fuel. At low load, a slight increase in EC emissions and a significant decrease in OC/EC ratio of PM2.5 after DOC were observed for B20.

Keywords diesel oxidation catalyst (DOC)      diesel particulate matters      elemental carbon (EC)      organic carbon (OC)      biodiesel     
Corresponding Author(s): HE Kebin,   
Issue Date: 01 August 2012
 Cite this article:   
Xiaoyan SHI,Kebin HE,Weiwei SONG, et al. Effects of a diesel oxidation catalyst on gaseous pollutants and fine particles from an engine operating on diesel and biodiesel[J]. Front Envir Sci Eng, 2012, 6(4): 463-469.
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Xiaoyan SHI
Kebin HE
Weiwei SONG
Xingtong WANG
Jihua TAN
Fig.1  Schematic diagram of dilution and sampling system
Fig.2  Effects of DOC on (a) NO, (b) HC, (c) CO, and (d) PM emissions at various test modes (speed/load): diesel fuel
Fig.3  Emissions of (a) TC, (b) OC, (c) EC fractions in PM from engine out and after the DOC at various test modes (speed /load): diesel fuel
speed (r·min-1)/ load%EC/(mg·g–1)OC/(mg·g–1)TC/(mg·g–1)
dieseldiesel+ DOCdieseldiesel+ DOCdieseldiesel+ DOC
Tab.1  Effect of DOC on fuel based emission factor (EF) of TC, EC, and OC in PM, diesel fuel
Fig.4  Effects of DOC on the percentages of OC (OC1–OC4) and EC (EC1–EC2) fractions in TC and OC/EC ratios: (a) diesel; (b) diesel; (c) B20
Fig.5  Emissions of (a) TC, (b) OC, and (c) EC fractions in PM from engine out and after DOC using B20 and compared those with base diesel fuel
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