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AdBlue® is a non-toxic, high-purity urea solution (32.5% urea, 67.5% demineralized water) used in Diesel Exhaust Fluid (DEF) systems to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water vapour, allowing diesel vehicles to meet Euro 4, 5, and 6 emission standards. It is injected into the exhaust stream before the Selective Catalytic Reduction (SCR) converter, enabling cleaner emissions for trucks, buses, and cars.
Key Aspects of AdBlue® and SCR Technology:
- Process: The SCR system injects AdBlue into the hot exhaust stream, where it breaks down into ammonia, which reacts with NOx over a catalyst, converting it into nitrogen and water vapor.
- Components: The system includes an AdBlue tank, a dosing control unit, an injection unit, and the SCR catalyst.
- Requirements: AdBlue must comply with ISO 22241 standards to prevent contamination and damage to the catalyst, with reputable products available for around $15–$50 per 10-20L container.
- Maintenance: It is not a fuel additive and must never be mixed with diesel. If the tank runs empty, the engine may refuse to start or enter a reduced-performance mode.
- Storage: AdBlue should be stored out of direct sunlight in cool temperatures (above -11°C, as it freezes at this point).
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Web results
SCR Technology
CleanAirBlue
https://cleanairblue.com › scr-technology
CleanAirBlue
https://cleanairblue.com › scr-technology
Selective Catalytic Reduction (SCR) is an after treatment technology that uses of an Aqueous Urea solution called AdBlue® to reduce harmful NOx emissions.Read more
People also ask
What is AdBlue for SCR?
A non-toxic, non-flammable, odourless and biodegradable fluid, AdBlue works in conjunction with a treatment system known as Selective Catalytic Reduction (SCR) to reduce harmful NOx (nitrogen oxide) gas.Feb 25, 2026
What is AdBlue? Why does your car need it? | RAC Drive
RAC
https://www.rac.co.uk › drive › advice › emissions › adb...
RAC
https://www.rac.co.uk › drive › advice › emissions › adb...
Does SCR use AdBlue?
Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that injects a liquid- reductant agent through a special catalyst into the exhaust stream of a diesel engine. The reductant source is usually DEF (Diesel Exhaust Fluid) – AdBlue.
SCR system and AdBlue FAQ's answered | Forté
Forté Lubricants
https://www.forteuk.co.uk › news › your-scr-system-and...
Forté Lubricants
https://www.forteuk.co.uk › news › your-scr-system-and...
Is SCR the same as DEF?
The SCR system substantially lowers the NOx emissions in the exhaust through a catalytic reduction process. An SCR system spreads an aqueous solution that contains 32.5% urea in the exhaust stream. This solution is known as Diesel Exhaust Fluid (DEF).Jul 19, 2024
DEF and SCR Maintenance Tips from the Diesel and DEF Experts
Mansfield Service Partners
https://msp.energy › def-and-scr-maintenance-tips-from-t...
Mansfield Service Partners
https://msp.energy › def-and-scr-maintenance-tips-from-t...
What is AdBlue called in the USA?
AdBlue® or Diesel Exhaust Fluid is the trade name for an aqueous solution of urea (technical name US32), commonly used as an additive in diesel powered vehicles together with Selective Catalytic Reduction (SCR) technology to reduce emissions which cause atmospheric pollution.Mar 14, 2015
What is AdBlue® & How Should It Be Stored? - Kingspan
Kingspan
https://www.kingspan.com › knowledge-articles › what-i...
Kingspan
https://www.kingspan.com › knowledge-articles › what-i...
Web results
Understanding the role of AdBlue® in SCR pollution ...
Bardahl
https://bardahl.fr › en-us › tips-and-tricks › understandi...
Bardahl
https://bardahl.fr › en-us › tips-and-tricks › understandi...
AdBlue® is an aqueous solution used in diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems to reduce emissions of pollutant gases, ...Read more
NOx reduction: everything you need to know about AdBlue ...
hifi filter
https://hifi-filter.com › Home › News
hifi filter
https://hifi-filter.com › Home › News
May 6, 2025 — In the SCR system, AdBlue is transformed into ammonia under the effect of heat. This reacts with the NOx and transforms it into nitrogen (N₂) ...Read more
SCR System & DEF (AdBlue): How It Works and Remove ...
dl.ge
https://dl.ge › blog
dl.ge
https://dl.ge › blog
Sep 22, 2025 — Learn how the SCR system and AdBlue work in trucks. Common faults, repair costs, and safe disable options like emulators and ECU tuning.
What is the SCR technology with AdBlue?
Stellantis.com
https://citroen.my-customerportal.com › citroen › article
Stellantis.com
https://citroen.my-customerportal.com › citroen › article
SCR stands for selective catalytic reduction, which is a technology used for reducing nitrogen oxides (NOx) from the exhaust gas of diesel engines.Read more
How SCR Technology Works
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › blog › how-scr-techn...
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › blog › how-scr-techn...
Apr 12, 2021 — AdBlue DEF is a consumable that must be used in SCR technology. SCR technology uses a catalyst system can effectively reduced the emission ...Read more
Deactivation of selective catalytic reduction
ecuware.com
https://www.ecuware.com › article › adblue-delete
ecuware.com
https://www.ecuware.com › article › adblue-delete
This technology injects ammonia into the exhaust system upstream of the SCR catalytic converter using a so-called carrier called ADBlue ®. With this technology ...Read more
Discussions and forums
Has the introduction of AdBlue technology affected the general durability ...
Reddit ·
r/automobil
· 20+ comments
· 8 months ago
Has the introduction of AdBlue technology affected the general durability ...
Reddit ·
r/automobil
· 20+ comments
· 8 months ago
AdBlue - What is it, and what does it do with your Diesel Exhaust
Reddit ·
r/Diesel
· 5 comments
· 9 years ago
AdBlue - What is it, and what does it do with your Diesel Exhaust
Reddit ·
r/Diesel
· 5 comments
· 9 years ago
What is AdBlue, and why is it important for modern diesel trucks? How do ...
Quora ·
3 answers
· 6 months ago
What is AdBlue, and why is it important for modern diesel trucks? How do ...
Quora ·
3 answers
· 6 months ago
See more
Web results
Understanding DPF, SCR & AdBlue in Diesel Cars
AutoCatalystMarket.com
https://autocatalystmarket.com › Home › Articles
AutoCatalystMarket.com
https://autocatalystmarket.com › Home › Articles
Aug 28, 2023 — SCR is a system that was created to reduce vehicle emissions. This technology works quite simply, a liquid called AdBlue is injected into ...Read more
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