How much urea is used in diesel engines?

Consumption of the urea solution is about 3\% of the diesel consumption. Diesel trucks average 6.5 miles per gallon (2.8 km/liter).

How does Selective Catalytic Reduction Work?

An SCR (Selective Catalytic Reduction) system is a system installed on diesel vehicles to reduce harmful Nitrous Oxide (NOx) emissions. It works by injecting an automotive grade urea, or Diesel Exhaust Fluid (DEF) through a specially designed catalyst, into the exhaust stream of a diesel engine.

Where is selective catalytic reduction used?

Selective catalytic reduction (SCR) has been applied to stationary source fossil fuel-fired combustion units for emission control since the early 1970s and is currently being used in Japan, Europe, the United States, and other countries.

Is urea a reducing agent?

NOx reduction with SNCR and SCR systems using urea as a reducing agent. Urea is an important raw material for the chemical industry. It is widely used in NOx control systems to reduce emissions of nitrogen oxides (NOx). With SNCR systems, urea is often the reducing agent chosen for safety reasons.

What is urea dosing system?

Abstract: Urea dosing systems must ensure injecting the precise amount of urea for the SCR reactions and uniform mixing of urea and ammonia with the exhaust gas. The urea dosing system components include pumps, injectors, mixers, and urea tanks.

What is urea used for?

Urea is used as a fertilizer and feed supplement, as well as a starting material for the manufacture of plastics and drugs.

Why would urea be preferable to ammonia as a method of controlling NOx emissions?

From the present studies it can be concluded that the ‘thermal selective reduction’ of NO, by urea is as effective as reduction by ammonia. This is important since urea is much less toxic and corrosive than ammonia. It is also a relatively cheap bulk chemical, and is easy to handle and transport.

What is catalytic reduction in chemistry?

Selective catalytic reduction (SCR) is a means of converting nitrogen oxides, also referred to as NO. x with the aid of a catalyst into diatomic nitrogen (N. 2), and water (H. 2O). A reductant, typically anhydrous ammonia (NH.

Is beta mercaptoethanol a reducing agent?

Pure liquid (14 M), beta-mercaptoethanol (BME, 2BME, 2-ME, b-mer, CAS 60-24-2) is a thiol reducing agent for cleaving protein disulfide bonds (cystine).