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- W4292267440 abstract "The widespread use of urea-SCR (selective catalytic reduction) aftertreatment to meet stringent heavy-duty vehicle (HDV) NOx emission standards has worldwide led to increased exhaust ammonia (NH3) slip. A prerequisite for the nitrogen (N) stable isotope (δ15N)-based source apportionment of ambient NH3 is that the N isotopic signatures of NH3 sources be well characterized. However, knowledge of δ15N values from HDV-emitted NH3 is still lacking. Using an on-board HDV emission measurement system, tailpipe-emitted gaseous NH3 from eight HDVs was collected during real-world driving conditions, and δ15N values were analyzed. We tentatively report an average δ15N-NH3 [mean ± 1σ = (−1.74 ± 6.27)‰] that is significantly higher (and hence potentially of diagnostic value) than that of naturally occurring volatile NH3 sources (less than −26‰) but only slightly lower than that of gasoline vehicles equipped with three-way catalytic converters. The observed variations in measured HDV δ15N-NH3 can be largely explained by the differential N-isotope fractionation during NH3 formation and the extent of ammonia conversion. We found that minor changes in SCR efficiency can cause relatively large fluctuations in δ15N-NH3, highlighting the difficulties and/or limitations with regard to attributing a characteristic δ15N to tailpipe NH3 in N-isotope balances and source partitioning efforts." @default.
- W4292267440 created "2022-08-19" @default.
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- W4292267440 date "2022-08-17" @default.
- W4292267440 modified "2023-10-15" @default.
- W4292267440 title "Isotopic Variability of Ammonia (δ<sup>15</sup>N-NH<sub>3</sub>) Slipped from Heavy-Duty Vehicles under Real-World Conditions" @default.
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- W4292267440 doi "https://doi.org/10.1021/acs.estlett.2c00526" @default.
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