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A series of tests run on the fully transient engine test benches, in Redwitz, Germany, clearly demonstrate that SCR technology is effective in both NOx and particulate emissions reduction. With different particulate measuring technologies, influences of parameters like the sulfur content of the fuel and the influence of the reducing agent are examined. A reduction of the particulate within the health-relevant range (around 100 nm) is proven. Apart from an effective reduction in the organic fraction of the PM, the system is also able to reduce the carbon fraction. Over the ESC / OICA cycle a decrease of elementary carbon of approximately 25% is obtained. Using an SCR system, a clear decrease of the nano-particulate mass emissions is found under all dosing conditions up to approximately 70%.

Selective Catalytic Reduction (SCR) of Nitrogen Oxide (NOx) emissions using ammonia or a 32.5%-urea solution has been used for many years in a variety of stationary applications. These applications include but are not limited to coal fired power plants, gas turbines, diesel locomotives, marine engines, as well as other stationary diesel and non-diesel engine applications. Global emission limits for mobile heavy-duty diesel engines are becoming increasingly rigid. In response to this trend the diesel industry has begun testing and applying various emission control technologies to mobile applications. SCR is one such technology. Europe is the first major market to introduce SCR into the heavy-duty (class 8) as well as medium-duty (class 4-7) truck applications. The EURO4 standards (effective Oct. 2005/2006) and the EURO5 standard (effective 2008) favor SCR as the NOx reduction technology of choice in the European Union (EU).