SCR catalytic substrate is mainly used in diesel engine exhaust system. SCR stands for selective catalytic reduction. Its principle is that under the action of a catalyst, the reducing agent NH3 reduces NO and NO2 to N2 at 290-400°C, and almost no NH3 oxidation reaction occurs.inquiry
According to the so-called SCR (Selective Catalytic Reduction ) process, the SCR catalysts are used to reduce nitrogen dioxide emissions. SCR specifies the process by which harmful nitrogen dioxide is selectively converted, that is, with a suitable catalyst as the target.
Exhaust gas from diesel engines usually contains excess oxygen (O2). In order to be able to reduce nitrogen dioxide under these conditions, a selective reducing agent is required, which converts the target nitrogen dioxide into nitrogen (N2) and water (H2O). A dilute solution of urea is used here as a reducing agent. In this case, urea is decomposed in the exhaust gas and forms an active ammonia reducing agent (NH3).
The SCR system is used in the field of private cars and commercial vehicles, and the technology is widely used to meet Euro VI or EPA 2010 emission standards. Many off-road diesel engines also use this technology. The SCR system can be used in a wide range of applications in the original equipment and retrofit markets.
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