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  • Опубліковано 27 сер 2023
  • 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. The SCR system involves several components packaged together with other parts of the emissions control system. Each manufacturer has its own variations of the type and sequencing of different components in the system.
    The design of SCR technology is such that it permits nitrogen oxide (NOx) reduction reactions to take place in an oxidizing atmosphere. It is called "selective" because it reduces levels of NOx using ammonia as a reductant within a catalyst system. The chemical reaction is known as "reduction" where the DEF is the reducing agent that reacts with NOx to convert the pollutants into nitrogen, water, and tiny amounts of CO2. The DEF is rapidly broken down to produce the oxidizing ammonia in the exhaust stream.
    SCR systems are active systems. Compared to the passive catalytic converters on gasoline vehicles, SCR systems require replenishing Diesel Exhaust Fluid (DEF) on a periodic basis to ensure emissions system performance. The need to refill DEF is directly related to vehicle fuel consumption. Failure to refill DEF tanks can result in immobilization of the vehicle or machine and a requirement for service.

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