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- W3144621084 abstract "Diesel vehicles are responsible for most of the traffic-related nitrogen oxide(NO x) emissions,including nitric oxide(NO) and nitrogen dioxide(NO2). The use of after-treatment devices increases the risk of high NO2/NO x emissions from diesel engines. In order to investigate the factors influencing NO2/NO x emissions, an emission experiment was carried out on a high pressure common-rail, turbocharged diesel engine with a catalytic diesel particulate filter(CDPF). NO2 was measured by a non-dispersive ultraviolet analyzer with raw exhaust sampling. The experimental results show that the NO2/NO x ratios downstream of the CDPF range around 20%–83%, which are significantly higher than those upstream of the CDPF. The exhaust temperature is a decisive factor influencing the NO2/NO x emissions. The maximum NO2/NO x emission appears at the exhaust temperature of 350°C. The space velocity,engine-out PM/NO x ratio(mass based) and CO conversion ratio are secondary factors. At a constant exhaust temperature, the NO2/NO x emissions decreased with increasing space velocity and engine-out PM/NO x ratio. When the CO conversion ratios range from 80% to 90%,the NO2/NO x emissions remain at a high level." @default.
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- W3144621084 date "2015-01-01" @default.
- W3144621084 modified "2023-10-18" @default.
- W3144621084 title "High NO2/NOX emissions downstream of the catalytic diesel particulate filter:An influencing factor study" @default.
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