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What is Selective Catalytic Reduction (SCR)?

It’s an advanced active emissions control technology system that reduces tailpipe emissions of nitrogen oxides (NOx) down to near-zero levels in newer generation diesel-powered vehicles and equipment. The SCR system involves several components packaged together with other parts of the emissions control system. Each manufacturer has its own variations of the type and sequencing of different components in the system.

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How does it work?

SCR is an active emissions control system. Hot exhaust gases flow out of the engine and into the SCR system where aqueous urea (known as Diesel Exhaust Fluid, or DEF) is sprayed onto a special catalyst. The DEF sets off a chemical reaction in the exhaust on a special catalyst that converts nitrogen oxides into nitrogen, water, and tiny amounts of carbon dioxide (CO2), natural components of the air we breathe. The exhaust also passes through a particulate filter somewhere in the system and then is then expelled through the vehicle tailpipe.

The design of SCR technology is such that it permits nitrogen oxide (NOx) reduction reactions to take place in an oxidizing atmosphere. It is called “selective” because it reduces levels of NOx using ammonia as a reductant within a catalyst system. The chemical reaction is known as “reduction” where the DEF is the reducing agent that reacts with NOx to convert the pollutants into nitrogen, water, and tiny amounts of CO2. The DEF is rapidly broken down to produce the oxidizing ammonia in the exhaust stream.

SCR Cleaning

Selective catalytic reduction (SCR) is a means of converting nitrogen oxides, also referred to as NOX with the aid of a catalyst. This is usually in the form of aqueous ammonia or urea under the trade name of Ad-Blue®, which is injected into the exhaust system by a dosing system from a tank on the vehicle.

This technology enables a lot of vehicles to comply with Euro 6 regulations for exhaust emissions but like all vehicle systems, these occasionally need servicing to remove the deposits created by the process. Our cleaning process can effectively clean SCR’s and save THOUSANDS of dollars!

We have invested in state-of-the-art cleaning machinery that quickly and fully flushes away all of the trapped soot, ash and other debris in an environmentally friendly process. This process achieves up to 98% of the original new efficiency with certified results.