scr in exhaust system
The state-of - wealthy emissions control technology of selective catalytic reduction (SCR) in a vehicle's exhaust system is designed to cut nitrogen oxide (NOx) emissions diesel engine fumes produce. This technology is useful for dissolving reams of NOx into harmless nitrogen and water. The various technological aspects of the SCR system are represented by the pairing of a catalyst, usually composed of either copper or precious metals, and diesel exhaust fluid (DEF) that has an injected urea-based solution. The fundamental steps that all SCR systems follow are similar: DEF is sprayed into the exhaust stream where it interacts with a catalyst to make NOx become nitrogen and water. SCR has meanwhile achieved extensive application in various vehicles and machinery with diesel engines, such as heavy-duty trucks, buses and industrial equipment, offering an ideal approach for meeting strict exhaust standards.