What is a selective catalyst reductant?

What is a selective catalyst reductant?

• A. An exhaust after treatment system which uses diesel exhaust fluid (DEF) to help reduce emissions.
• B. A type of fuel injector.
• C. A method to increase turbo efficiency.
• D. A brake force enhancement device.

Answer: (A)

Selective catalytic reduction is an exhaust aftertreatment method that lowers NOx emissions from diesel engines by injecting a reductant, typically diesel exhaust fluid, into the exhaust stream. The DEF reacts with NOx on a catalyst, forming nitrogen and water, thereby reducing harmful emissions. This system sits in the exhaust path and is distinct from engine components like fuel injectors, turbochargers, or braking devices.

Selective catalytic reduction is an exhaust aftertreatment method that lowers NOx emissions from diesel engines by injecting a reductant, typically diesel exhaust fluid, into the exhaust stream. The DEF reacts with NOx on a catalyst, forming nitrogen and water, thereby reducing harmful emissions. This system sits in the exhaust path and is distinct from engine components like fuel injectors, turbochargers, or braking devices.