YOU PUT YOUR LEFT LEO IN...
9th March 2000, Page 17
9th March 2000
Page 17
Page 17, 9th March 2000
— YOU PUT YOUR LEFT LEO IN...
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• Stays one and two of tne SCRT remove CO, HC and PMs. NOx is reduced to nitrogen in the two SCR stages, in combination with the injected reducing agent, ammonia. Excess ammonia is then removed in the final oxidation catalyst stage.
The formulae for the reactions between the ammonia (NH3) and NOx (NO and NO2) are as follows: 4N0 + 4h1H3 + 02 > 4N2 + 6H20 and 6NO2 + 8NH3 > 7N2 + 12H20.
Johnson Matthey predicts CRTs and engine management tweaking (probably cooled exhaust gas recirculation) will be enough to meet Euro-4 standards, with SCAT coming into its own for Euro-5.