globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2019.117021
论文题名:
Size-resolved physico-chemical characterization of diesel exhaust particles and efficiency of exhaust aftertreatment
作者: Zeraati-Rezaei S.; Alam M.S.; Xu H.; Beddows D.C.; Harrison R.M.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 222
语种: 英语
英文关键词: Diesel engines ; Efficiency ; Gas chromatography ; Gas emissions ; Mass spectrometry ; Paraffins ; Particle size ; Particles (particulate matter) ; Particulate emissions ; Volatile organic compounds ; Diesel particulate filters ; Light-duty diesel engines ; Particulate Matter ; Physico-chemical characterization ; Physicochemical characteristics ; Semivolatile organic compounds ; SVOC ; Two dimensional gas chromatography ; Particle size analysis ; alkane ; aromatic compound ; cycloalkane ; volatile organic compound ; chemical compound ; concentration (composition) ; efficiency measurement ; equipment ; exhaust emission ; instrumentation ; oxidation ; physicochemical property ; pollutant removal ; airborne particle ; catalyst ; exhaust gas ; filtration ; mass fragmentography ; oxidation ; particle size ; particulate matter ; physical chemistry ; priority journal
学科: Diesel engine ; DOC ; DPF ; Particle size magnifier ; Particulate matter ; SVOC
中文摘要: Knowledge of physico-chemical characteristics of particle emissions from combustion engines is essential for various modelling purposes and environmental analysis. It is of particular interest to obtain emission factors of intermediate-volatility organic compounds (IVOC) and semi-volatile organic compounds (SVOC) which have not been comprehensively reported in the literature due to the limitations of characterisation methods. In the current study, a multi-stage Nano impactor and the two-dimensional gas chromatography (GC × GC) mass spectrometry (MS) technique were used to comprehensively characterise size fractionated particle phase emissions from a light-duty diesel engine based on the particle size, compound groups and carbon number. The number size distributions of particles between 1.2–1000 nm were also investigated. Exhaust gas samples were taken before a diesel oxidation catalyst (DOC), after the DOC and after the DOC combined with a catalysed diesel particulate filter (DPF). In samples taken before the DOC (engine-out), the total particulate IVOC+SVOC (I+SVOC) emission factor was approximately 105 milligrams per kilogram of fuel consumed (which was ~49% of the total particle mass) and the peak concentration of different classes of I+SVOC was found in the particle size bins close to 100 nm where most of the total particle mass was found. Alkanes, with maximum abundance at C24, were the most dominant class of I+SVOC in samples taken before and after the aftertreatment devices. Total particulate I+SVOC emissions were removed with ~75% efficiency using the DOC and by ~92% using the DOC+DPF. Alkanes, cycloalkanes, bicyclics and monoaromatics were all removed by >90% using the DOC+DPF; however, oxygenates were removed by only ~76% presumably due to the oxidation of different species within the aftertreatment system and reappearance as oxygenates. A high concentration of particles was measured in the sub-2.5 nm range. These particles were efficiently removed by the DOC+DPF due to both the loss of I+SVOC and physical filtration. © 2019 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160650
Appears in Collections:气候变化与战略

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作者单位: Department of Mechanical Engineering, School of Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; National Centre for Atmospheric Science, School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom

Recommended Citation:
Zeraati-Rezaei S.,Alam M.S.,Xu H.,et al. Size-resolved physico-chemical characterization of diesel exhaust particles and efficiency of exhaust aftertreatment[J]. Atmospheric Environment,2020-01-01,222
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