Scania and Umicore present the next generation Exhaust Aftertreatment Systems (EATS) at the 42nd International Vienna motor symposium

There is a growing demand for cleaner and more energy-efficient vehicles to overcome today’s global environmental challenges. This demand translates into tighter emission regulations for commercial and passenger vehicles and the reduction of CO2 emissions. New advanced emission legislations in Europe, the US, and China are under development.

Current Euro VI EATS are reaching their performance limit related to cold start and low engine load conditions. Scania recognized such a trend early and realized the potential of an improved and innovative system. The system would not only be able to meet future emission legislations but also enable engine calibration with significantly improved fuel consumption. 

Scania’s Twin SCR system approach allows the EATS to remove NOx with very high efficiency at a significantly broader range of temperatures thanks to the positioning of the SCR catalysts up- and DPF in the EATS, respectively.

The new Twin SCR system advantages and capabilities also came along with specific challenges on catalyst robustness, poisoning resistance, and needs for further catalyst optimization. Scania managed to optimize the Twin SCR system to meet all relevant requirements through developments and testing in close cooperation with Umicore. 

System performance and durability are key requirements though not the only ones. The ever-growing complexity of the EATS demands that platforms are developed with global scope to keep them cost-competitive. Meeting all global regulations is thus on the requirements list, and given the system is based on Vanadium SCR catalysts, the vanadium sublimation phenomena is of particular relevance. 

Through extensive research, vanadium sublimation has been studied to support introducing the Twin SCR platform in markets like China and the United States. This research has provided Umicore with an understanding of the phenomenon, which was key to supporting Scania and developing the next generation catalysts with reduced sublimation behavior.

Scania’s new Twin SCR system provides the Traton group with a highly efficient aftertreatment solution that meets current global emissions requirements. Furthermore, by introducing this new architecture to the market already in 2020, Scania positions the Traton group in the lead for upcoming emission requirements.