Urea al bus

[Miquel]

Algú sap per a que s'utilitza la Urea als autobusos??
Ho he vist als Noge de Tusgsal però no als de TB. Als de TB en aquell compartiment hi posa aigua (almenys els que he vist).

[genissimon]

De l'edició anglesa de la viquipèdia:

http://en.wikipedia.org/wiki/Urea
[...]
Uses
[...]
Automobile systems
Urea is used in SNCR and SCR reactions to reduce the NOx pollutants in exhaust gases from combustion from diesel, dual fuel, and lean-burn natural gas engines. The BlueTec system, for example, injects water-based urea solution into the exhaust system. The ammonia produced by the hydrolysis of the urea reacts with the nitrogen oxide emissions and is converted into nitrogen and water within the catalytic converter.[...]

Salut !!