Selective catalytic reduction (SCR) means converting nitrogen oxides, also referred to as NO x with the aid of a catalyst into diatomic nitrogen (N 2), and water (H 2 O). A reductant, typically anhydrous ammonia (NH 3), aqueous ammonia (NH 4 OH), or a urea (CO(NH 2) 2) solution, is added to a stream of flue or exhaust gas and is reacted onto a ...

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.

Feb 25, 2024 · SCR is a post-combustion treatment process that selectively reduces NOx emissions in exhaust gases. It involves injecting a reductant, typically ammonia or urea, into the exhaust stream, which then reacts with NOx in the presence of a catalyst.

Jan 10, 2024 · While catalytic converters act like a filter that traps harmful emissions, SCR systems actively inject Diesel Exhaust Fluid (DEF) into the exhaust, which chemically reacts with nitrogen oxides (NOx) to form harmless nitrogen and water.

Jul 2, 2020 · Selective Catalytic Reduction. This exhaust gas after-treatment technology has a NOx abatement capability Of more than 80%. The SCR concept involves injecting a Urea-Water solution into the exhaust gas stream in combination with a special catalyst unit.

Aug 15, 2019 · Selective catalytic reduction with NH 3 (NH 3 –SCR) is the most efficient technology to reduce the emission of nitrogen oxides (NO x) from coal-fired industries, diesel engines, etc.

• Higher NOx reductions than low-NOx burners and Selective Non-Catalytic Reduction (SNCR) • Applicable to sources with low NOx concentrations • Reactions occur within a lower and broader temperature range than SNCR.

Apr 1, 2024 · Selective catalytic reduction (SCR) has emerged as a vital tool for mitigating NOx emissions. This comprehensive review explores the advancements in SCR technologies and their critical role in NO x reduction by investigating various reducing agents.

Selective Catalytic Reduction - SCR. Applications that require a high NOx reduction level, the most feasible technology is often Selective Catalytic Reduction (SCR) as it provides a reduction rate up to 95%. In SCR of NOx nitrogen oxides are reduced to …

Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that reduces tailpipe emissions of nitrogen oxides (NOx) down to near-zero levels in newer generation diesel-powered vehicles and equipment.