Blue is the new green
ONE OF the key technologies used to reduce the emission of the various oxides of nitrogen, collectively known as NOX, is called Selective Catalytic Reduction (SCR), better known as Adblue.
NOX is produced from the reaction of nitrogen with oxygen during the combustion process and is present in the exhaust emissions of both petrol and diesel engines, but more so in diesel donks.
Adblue is a urea solution injected into the engine’s exhaust system upstream from the catalytic converter. Once in the catalytic converter, a chemical reaction between the Adblue and the NOX produces harmless nitrogen (the major constituent of air) and water, released as steam.
The fluid is held in a small tank and is generally refilled when the vehicle is serviced, but it’s also widely available at service stations for when the system needs to be replenished between services.