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Diesel Exhaust Fluid (DEF), also known as AdBlue or AUS 32, is a solution of urea and water injected into the exhaust system of diesel engines to reduce harmful nitrogen oxide (NOx) emissions through a process called Selective Catalytic Reduction (SCR)

AdBlue / Diesel Exhaust Fluid (DEF) Overview

AdBlue is a trademarked name for a Diesel Exhaust Fluid (DEF) used in diesel engines equipped with SCR (Selective Catalytic Reduction) technology. It reduces harmful nitrogen oxides (NOx) from exhaust gases, helping vehicles meet environmental emission standards like BS-VI / Euro VI.

�� Chemical Composition

• ISO 22241 standard ensures consistent quality and performance globally.

• AdBlue is non-toxic, non-flammable, colorless, and slightly alkaline (pH ~9–10).

⚙️ How AdBlue Works

1. Injection: AdBlue is injected into the diesel exhaust stream before the SCR catalyst.

2. Thermal Decomposition: Heat converts urea into ammonia (NH₃) and carbon dioxide (CO₂).

3. NOx Reduction: Ammonia reacts with nitrogen oxides:

4NO+4NH3+O2→4N2+6H2O4NO + 4NH₃ + O₂ → 4N₂ + 6H₂O4NO+4NH3​+O2​→4N2​+6H2​O 6NO2+8NH3→7N2+12H2O6NO₂ + 8NH₃ → 7N₂ + 12H₂O6NO2​+8NH3​→7N2​+12H2​O

1. Result: Up to 90% reduction in NOx emissions, making exhaust gases environmentally safer.

�� Physical Properties

Diesel Exhaust Fluid (DEF) — Complete Overview

Diesel Exhaust Fluid (DEF) is a non-toxic urea-based solution used in diesel engines equipped with Selective Catalytic Reduction (SCR) technology. It helps reduce harmful nitrogen oxide (NOx) emissions, converting them into harmless nitrogen and water vapor, making diesel vehicles more environmentally friendly and compliant with emission standards such as BS-VI / Euro VI.