5417856
Decomposition Reactor
Cummins®

The Decomposition Reactor (Part Number: 5417856) manufactured by Cummins® is a device used in Selective Catalytic Reduction (SCR) systems in commercial trucks. It is a critical component in the exhaust aftertreatment system that helps reduce harmful nitrogen oxide (NOx) emissions. Its primary function is to convert nitrogen oxides into harmless nitrogen and water vapor. This chemical reaction occurs through a process known as decomposition, where the decomposition reactor assists in breaking down the NOx molecules into their constituent elements. By utilizing a catalyst, this part facilitates the conversion of nitrogen oxides, which are harmful pollutants, into less harmful gases. The Decomposition Reactor is typically installed downstream from the diesel oxidation catalyst and diesel particulate filter in the exhaust system. It requires a constant supply of urea-based diesel exhaust fluid (DEF) to effectively operate. The DEF is injected into the decomposition reactor, where it reacts with the NOx gases, resulting in the decomposition of harmful nitrogen oxides into less harmful components. Overall, the Decomposition Reactor plays a vital role in reducing emissions and ensuring compliance with environmental regulations while optimizing the performance of commercial trucks equipped with SCR technology.