Title: Emissions of a Euro 6b Diesel Passenger Car Retrofitted with a Solid Ammonia Reduction System
Citation: ATMOSPHERE vol. 10 no. 4 p. 180
Publisher: MDPI
Publication Year: 2019
JRC N°: JRC116291
ISSN: 2073-4433 (online)
URI: https://www.mdpi.com/2073-4433/10/4/180
DOI: 10.3390/atmos10040180
Type: Articles in periodicals and books
Abstract: Nitrogen oxides (NOx) emissions from diesel vehicles are a serious environmental concern. Prior to the introduction of on-road tests at type approval, vehicle on-road NOx emissions were found many times higher than the applicable limits. Retrofitting an existing vehicle is a short/mid-term solution. We evaluated a NOx reduction retrofit system installed on a Euro 6b diesel passenger car both in the laboratory and on the road. The retrofit consisted of an under-floor SCR (Selective Catalytic Reduction) for NOx catalyst in combination with a solid ammonia based dosing system as the NOx reductant. The retrofit reduced NOx emissions from 25% (50 mg/km) to 82% (725 mg/km) both in the laboratory and on the road. The minimum reduction was achieved at cold start cycles and the maximum at hot start cycles. The retrofit had small effect on CO2 (fuel consumption). No ammonia emissions were detected and the N2O increase was negligible at cold start cycles, but up to 17 mg/km at hot start cycles. The results showed that the retrofit technology could be beneficial even for high emitting Euro 6b diesel vehicles.
JRC Directorate:Energy, Transport and Climate

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