Selective Catalytic Reduction (SCR) refers to reducing Nitrogen Oxides (NOx) in diesel exhaust.
- A reductant, usually ammonia solution is combined with a stream of exhaust gas and reacted to a catalyst
- The SCR reaction occurs, as the reaction towards completion, the products are nitrogen and carbon dioxide are produced
- Selective Catalytic Reduction is sensitive to contamination and plugging which came from abnormal occurrences, even normal operation
- The Diesel Particulate Filter is used as an after treatment in order to conform with the requirements to significantly reduce exhaust emissions