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APP FACTS ABOUT DEF > Back to DEF Main Page What is Selective Catalytic Reduction (SCR)? Selective Catalytic Reduction (SCR) is one of the most cost-effective and fuel-efficient vehicle emissions control technologies available to reduce diesel engine emissions. In the trucking industry, where operations and profitability are necessary, the future is SCR. With the ability to deliver better fuel-efficiency than alternative engines using massive rates of exhaust gas recirculation (EGR), the greatest benefit of using SCR is its performance advantage. In the commercial trucking industry, including heavy and medium duty trucks, the ability to reduce emissions to near-zero levels while also delivering a 3-5% diesel fuel savings distinguishes SCR as one of the only emissions control technologies that is as good for business as it is for the environment. The Environmental Protection Agency (EPA) has set new vehicle emissions standards which will require greater vehicle fuel-efficiency and lower emissions levels. The new standards were effective in 2009 for passenger cars and light duty trucks and in 2010 for Class 8 heavy duty commercial trucks. To date, Selective Catalytic Reduction technology is the only vehicle emissions control technology that has been proven to be capable of meeting these standards. In heavy-duty trucks, SCR will reduce: • NOx emissions up to 90% • Hydro carbons (HC) and carbon monoxide (CO) emissions by 50–90% • Particulate matter (PM) emissions by 30–50% When the EPA 2010 emissions standards take effect, no heavy-duty diesel engine can be emitting levels of nitrogen oxide (NOx) higher than .2 g/bhp-hr (grams per brake horsepower-hour), a standard more stringent than any in place in Europe.  SCR will allow the engine to stay focused on producing efficient power and torque over a long life. By freeing the engine from emissions control responsibilities, SCR enables greater fuel-efficiencies and reduces the cost of operations. Through today's emissions control technologies, particulate matter (PM) and nitrogen oxides (NOx) are effectively and efficiently handled without stressing the engine. That means the engine runs better, stays cleaner and lasts longer. Optimization of the engine leads to better fuel efficiency and reduced particulate output. As a result, the diesel particulate filter (DPF) needs less active regeneration (a filter cleaning process), further enhancing fuel efficiency. Any additional NOx generated by the optimization is then efficiently and effectively handled by the SCR catalyst which reduces NOx in the exhaust stream and at the tailpipe. In this way, SCR-equipped trucks can easily achieve even the lowest emissions requirements.
Note: Information provided by Facts About SCR |
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