ASC (Ammonia Slip Catalyst) is used in exhaust gas treatment, primarily in conjunction with SCR systems, to convert excess unreacted ammonia (NH₃) into nitrogen (N₂) and water (H₂O), preventing ammonia emissions pollution.

Key Points:

  1. Function: Eliminates residual ammonia after SCR, avoiding secondary pollution.
  2. Applications: Diesel vehicles, gas engines, industrial denitrification systems, etc.
  3. Advantage: Enhances environmental compliance, meeting strict emission standards (e.g., China VI, Euro VI).
  4. Principle: Catalytic oxidation (4NH₃ + 3O₂ → 2N₂ + 6H₂O).

In short, ASC acts as a “safety valve” for SCR systems, ensuring no ammonia leaks into the atmosphere.