RT info:eu-repo/semantics/article
T1 Predicting NOx emissions from ammonia engines – Fuel and thermal effects
A1 Cova Bonillo, A.
A1 Gabana Molina, Pedro
A1 Khedkar, N.
A1 Brinklow, G.
A1 Wu, M.
A1 Herreros, J.M.
A1 Zeraati-Rezaei, S.
A1 Tsolakis, A.
A1 Ambalakatte, A.
A1 Cairns, A.
A1 Hall, J.
K1 Ammonia
K1 NOx
K1 Prediction
K1 Combustion
K1 Engine
K1 Kinetic mechanism
AB Ammonia, a promising zero-carbon fuel, faces engine application challenges from high NOx and ammonia slip. A key knowledge gap remains in predicting NOx and ammonia slip with chemical kinetic mechanisms within complex engine environments, beyond simple metrics. This research evaluates 14 ammonia combustion mechanisms in a spark-ignition (SI) engine model, using a two-zone thermodynamic approach. Experimental data from stoichiometric pure ammonia combustion in a research engine validate NOx predictions. The analysis details NOx formation, NH3 slip, NO production rates, and differentiates thermal-NOx from fuel-NOx. While most mechanisms predict NOx within 20 % error, those by Otomo, Stagni, and Nakamura show superior accuracy. Furthermore, a significant divergence in N2O predictions was found; only the Konnov mechanism yielded plausible concentrations (14–24 ppm), exposing a common limitation in other models. This study identifies thermal-NOx as ∼75 % of total NOx, offering vital insights for targeted emission control and guiding mechanism selection for engine development.
PB Elsevier
SN 0360-3199
YR 2025
FD 2025
LK https://uvadoc.uva.es/handle/10324/79300
UL https://uvadoc.uva.es/handle/10324/79300
LA spa
NO International Journal of Hydrogen Energy, Volume 187, 2025, 150734
NO Producción Científica
DS UVaDOC
RD 06-nov-2025