Dual Fuel engines (LNG+pilotMGO) have lower amount of NOx in the exhausts than Fuel engines.
But what about the ratio NO2/NO ?
Dominique Pons : The main advantage of using an SCR system is that it converts NOx into Nitrogen gas and water molecules as given in the equation below.
NO + NO2 + 2NH3 → 2N2 + 3H2O
As it can be seen from the equation, the reduction process is not limited to NO or NO2, it reduces both the emissions as a part of NOx reduction.
To answer you, NO2/NO ratio will also be reduced.
Oxides of nitrogen emission from the tailpipe is a potential generic issue for engines with diesel exhaust gas after-treatment.Possible emission of oxides of nitrogen of engines with diesel after-treatment in general deserves further investigations. NOx emissions are higher after a cold start. SCR takes time before it reaches its working temperature but it can be averaged out over a longer trip time of the vehicle.
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