Selective Catalytic Reduction

The Advantages of SCR for Trucks
SCR's major advantage is its ability to deliver excellent fuel efficiency, especially compared to engines using higher rates of exhaust gas recirculation (EGR) for NOx control. By controlling NOx emissions in the exhaust through SCR, instead of in the combustion process through EGR, diesel engines can be tuned for optimum fuel efficiency - a critical concern with the high prices for diesel fuel.

Using lower rates of EGR also results in lower heat rejection, so no massive coolers made from exotic metals are required, resulting in an efficient cooling system. Furthermore SCR enables greater power densities, which means a smaller displacement engine can deliver the horsepower which otherwise would demand a larger, heavier engine.

While Selective Catalytic Reduction (SCR) is a new system for North American trucks, it is not a new technology. SCR is a reliable and proven technology, and is now the dominant emissions reduction technology for heavy-duty trucks in Europe - in fact, there are nearly 500,000 SCR trucks in operation throughout Europe today. In addition, SCR has been used for several decades in marine and large stationary diesel engines.

SCR is a straightforward aftertreatment technology that only requires the addition of DEF approximately every other diesel fill-up. The SCR system itself requires very little maintenance and no driver action while the truck is operating.

Did you know? According to an online study conducted in November 2008, 53% of truck buyers will likely consider the purchase of SCR technology to meet the 2010 EPA standards compared to only 29% that will likely consider increased EGR. To find out more, click here.

Click here for interviews with top industry professionals exploring the impact of SCR technology on their companies, the freight industry, the infrastructure and the general public.

Recent SCR news:

BlueTec SCR engines almost ready market ready, Today's Trucking

BlueTec technology reaches 25 million miles, Bulk Transporter

EPA 2010: Testing Testing, Working Evaluation, Heavy Duty Trucking

2010 Engine makers upbeat on new products, examiner.com

Engine makers discuss 2010 products, eTrucker.com

2010 engine test fleets weigh in, Fleet Equipment

Freightliner puts drivers in SCR trucks, Truck News

Daimler Trucks announces 2010 pricing, TruckNews

MS Fuel Card set for DEF, Fleet Owner

DEF Coming to Pilot Pumps, Fleet Owner

Study Indicates Preference for SCR, Bulk Transporter