DEF Systems and Aftertreatment Architecture Considerations

As emissions regulations become more stringent, new aftertreatment technologies are necessary. To assist in the reduction of NOx emissions, liquid-based SCR technologies have been adopted globally. The most common technique used to introduce ammonia (NH3) into the exhaust stream is via a dosing system metering diesel exhaust fluid (DEF). SCR system efficiency relies heavily on how uniformly the NH3 is distributed across the catalyst face.