On-road measurement of NH3 and N2O emissions from a Euro V heavy-duty vehicle. (August 2016) - Suarez-Bertoa, Ricardo
Abstract: The use of selective catalytic reduction systems (SCR) to abate NOx vehicular emissions brings new concerns on the emissions of the byproducts NH3 and N2 O. Therefore, NH3 and N2 O on-road emissions from a Euro V truck equipped with a SCR were measured in real time using a QCL-IR. Results bring to light possibility to perform this kind of real time measurements for other pollutants besides, hydrocarbons, NOx, CO and CO2 . The capability to measure NH3 and N2 O in a second-by-second basis will allow applying the currently agreed regulatory emissions evaluation for gaseous compounds. Average N2 O emission factors calculated applying the current PEMS-based data analysis to all available windows from the tests ranged from 0.063 g/kWh to 0.139 g/kWh. Average NH3 concentrations ranged from 0.9 ppm to 5.7 ppm. Although calculated average N2 O and NH3 emissions were within current limits, NOx emissions were substantially higher than Euro V limits under the studied conditions. Highlights: NH3 and N2 O on-road emissions can be measured using a QCL-IR. Substantial NH3 and N2 O emissions were observed. Current regulatory emissions evaluation for HD could be applied for NH3 and N2 O.