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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