title: Experimental study on the nitrogen dioxide and particulate matter emissions from diesel engine retrofitted with particulate oxidation catalyst.
abstract: A particulate oxidation catalyst (POC) was employed to perform experiments on the engine test bench to evaluate the effects on the nitrogen dioxide (NO2) and particulate matter (PM) emissions from diesel engine. The engine exhaust was sampled from both upstream and downstream of the POC. The results showed that the POC increased the ratios of NO2/NOx significantly in the middle and high loads, the ratio of NO2/nitrogen oxides (NOx) increased 4.5 times on average under all experiment modes with the POC. An engine exhaust particle sizer (EEPS) was used to study the particle number-weighted size distributions and the abnormal particle emissions with the POC. The results indicated that the average reduction rate of particle number (PN) was 61% in the operating range of the diesel engine. At the engine speed of 1,400 r/min, the reduction rates of PN tended to decrease with the larger particle size. In the long time run under the steady mode (520 Nm, 1,200 r/min), abnormal particle emissions after the POC happened seven times in the first hour, and the average PN concentration of these abnormal emission peaks was much higher than that in normal state. The particle emissions of peaks 1-5 equaled the particles emitted downstream of the POC in normal state for 1.9h in number concentration, and for 3.6h in mass concentration. The PN concentrations tended to increase over time in 5h under the steady engine mode and the increase of the PN in the size range of 6.04-14.3 nm was more evident.
authors.affiliation: School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Xiangyu
authors.initials: X
authors.lastname: Feng
authors.affiliation: School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China. Electronic address: fengxy010@gmail.com.
authors.forename: Yunshan
authors.initials: Y
authors.lastname: Ge
authors.affiliation: School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Chaochen
authors.initials: C
authors.lastname: Ma
authors.affiliation: School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Jianwei
authors.initials: J
authors.lastname: Tan
authors.affiliation: School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Linxiao
authors.initials: L
authors.lastname: Yu
authors.affiliation: School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Jiaqiang
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D008956:Models, Chemical; D009585:Nitrogen Dioxide / Q000032:analysis*; D010084:Oxidation-Reduction; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D001335:Vehicle Emissions; D009585:Nitrogen Dioxide
keywords: CO; Carbon Monoxide; DOC; DPF; Diesel; Diesel Oxidation Catalyst; Diesel Particulate Filter; EEPS; ESC; Engine Exhaust Particle Sizer; Euro Steady-state Cycle; HC; Hydrocarbon; NO; NO(2); NOx; Nitric Oxide; Nitrogen Dioxide; Nitrogen Oxides; Nitrogen dioxide; PM; PN; POC; Particle Number; Particulate Matter; Particulate Oxidation Catalyst; Particulate matter; Particulate oxidation catalyst; SCR; Selective Catalytic Reduction