DIESEL EXHAUST FLUID

The SCR technology uses a catalytic reaction that breaks down any dangerous oxides of nitrogen (NOx). An SCR system’s main parts include the SCR catalyst, injection unit, tank and dosing control unit. SCR is able to work by chemical reactions triggered by heat. These chemical reactions need a continuous feed of ammonia gas. In vehicles, SCR delivers that needed ammonia through DEF. Small amounts of DEF are injected into the exhaust stream by spraying and then the DEF vaporizes and decomposes to become ammonia and carbon dioxide. The ammonia is what works with the SCR catalyst to convert the harmful NOx emissions diesel engines produce into harmless levels of nitrogen and water vapor. Why SCR? 3