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Banshee · 13-10-2013, 13:53

I know what it is and what it does and understand the legislation around it but HOW does it work?

I've read that it's sprayed into the exhaust but how does it reduce pollution? From what I've read its an Aqueous Urea solution, does anyone know the formula for the chemical reaction with the carbons?

rustic · 13-10-2013, 17:58

Here we go...

Diesel engines run with a lean burn air-to-fuel ratio (overstoichiometric ratio) to ensure the full combustion of soot and prevent unburnt fuel from being exhausted. The excess of oxygen necessarily leads to generation of nitrogen oxides (NOx), which are harmful pollutants, from the nitrogen in the air. Selective catalytic reduction is used to reduce the amount of NOx released into the atmosphere. Diesel exhaust fluid (from a separate DEF tank) is injected into the exhaust pipeline, the aqueous urea vaporizes and decomposes to form ammonia and carbon dioxide. Within the SCR catalyst, the NOx are catalytically reduced by the ammonia (NH3) into water (H2O) and nitrogen (N2), which are both harmless; and these are then released through the exhaust.[3]

Simples...

Urea... in liquid form...
Is someone taking the Pi*s

Thomas-the-Terrano2 · 13-10-2013, 18:18

i herd! it was sheep pee? or is that baalox?

Banshee · 13-10-2013, 19:17

Quote:

Originally Posted by rustic

Here we go...

Diesel engines run with a lean burn air-to-fuel ratio (overstoichiometric ratio) to ensure the full combustion of soot and prevent unburnt fuel from being exhausted. The excess of oxygen necessarily leads to generation of nitrogen oxides (NOx), which are harmful pollutants, from the nitrogen in the air. Selective catalytic reduction is used to reduce the amount of NOx released into the atmosphere. Diesel exhaust fluid (from a separate DEF tank) is injected into the exhaust pipeline, the aqueous urea vaporizes and decomposes to form ammonia and carbon dioxide. Within the SCR catalyst, the NOx are catalytically reduced by the ammonia (NH3) into water (H2O) and nitrogen (N2), which are both harmless; and these are then released through the exhaust.[3]

Simples...

Urea... in liquid form...
Is someone taking the Pi*s

Well stolen from Wikipedia lol

13-10-2013, 13:53	#1
Banshee Moderator Join Date: Jul 2012 Location: West Midlands Vehicle: 04 2.7 SWB Terrano II Van Posts: 13,526	AdBlue I know what it is and what it does and understand the legislation around it but HOW does it work? I've read that it's sprayed into the exhaust but how does it reduce pollution? From what I've read its an Aqueous Urea solution, does anyone know the formula for the chemical reaction with the carbons? __________________ Moderator 04' Terrano II SE 2.7 TDi SWB Commercial in Silver - Project Thread Toyo Open Country M/T 33's on 10J Steels, Super Strong Steering Job Navara D22 Snorkel, Front LOKKA, Maunal Hubs, EGR Blank TunitII ECU Chip, 3" Body Lift, 2" Suss Lift, Heat Exchanger Black Interior, 3.0 Borg&Beck Clutch, Eckes Heated Fuel Filter 99' Y61 Patrol GR SE 2.8 TD6 LWB in Blue/Silver - Project Thread Engine Transplant - In Progress!!!

13-10-2013, 17:58	#2
rustic Senior Member Join Date: Feb 2007 Location: Staffordshire Vehicle: Maverick Mk I 2.7 TD LWB Posts: 7,825	Here we go... Diesel engines run with a lean burn air-to-fuel ratio (overstoichiometric ratio) to ensure the full combustion of soot and prevent unburnt fuel from being exhausted. The excess of oxygen necessarily leads to generation of nitrogen oxides (NOx), which are harmful pollutants, from the nitrogen in the air. Selective catalytic reduction is used to reduce the amount of NOx released into the atmosphere. Diesel exhaust fluid (from a separate DEF tank) is injected into the exhaust pipeline, the aqueous urea vaporizes and decomposes to form ammonia and carbon dioxide. Within the SCR catalyst, the NOx are catalytically reduced by the ammonia (NH3) into water (H2O) and nitrogen (N2), which are both harmless; and these are then released through the exhaust.[3] Simples... Urea... in liquid form... Is someone taking the Pi*s __________________ Ford Maverick GLX 1995 2.7TD LWB in illusion silver, 98k miles. Owned since new, for 22 years. Best car I have ever owned. Just wish I could drive it more.

13-10-2013, 18:18	#3
Thomas-the-Terrano2 Moderator Join Date: Dec 2004 Location: Hackenthorpe Sheffield Vehicle: Terrano2 R20 lwb 2.7TDi Posts: 5,234	i herd! it was sheep pee? or is that baalox? __________________ M6YTB / 20YTB '60' 2010 Ford C Max Zetec 1.6i, black '56' 2006 Jeep Grand Cherokee 3.0TD, silver 2021 Bailey Pegasus Grade SE Turin caravan Smile, its more likely to confuse. One Life, Don't Just Live It, Drive a Nissan, or ...... a Jeep. Owner of Nissan 4x4s 2005 to 2019, and maybe in the future too!