Chemical characterization of the condensed exhaust from a DI SI hydrogen-powered engine

Lower ignition energy (0.02 mJ), wider inflammability range (0.21<?<7.34), higher calorific value (141,9 MJ/Kg) and higher flame propagation speed, compared to gasoline, make hydrogen an interesting and suitable substitute for application in spark ignition (SI) engines. As a gaseous fuel, hydrogen, once introduced into the intake manifold and well mixed with air, improves combustion efficiency compared to a liquid fuel and results in a reduction of exhaust emissions. In the present work, we studied the emissions of a hydrogen-fueled SI engine for investigating if it can be considered totally "green".