Diesel NOₓ-Aftertreatment Systems for North America

Authors

Dr.phil.nat. U. Göbel, Dipl.-Ing. W. Müller, Dr.-Ing. I. Grisstede, Dr.rer.nat. F. Rohr, Umicore AG & Co. KG, Hanau

Year

2008

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 672

Summary

New and innovative exhaust aftertreatment systems for the reduction of nitrogen oxides (NOx) are a key element for the commercial launch of diesel applications in North America.


For heavy passenger cars and SUVs urea-SCR based systems are the system of choice. For medium sized and light passenger cars the NOx-storage catalyst or lean NOx trap (LNT) is the preferred solution. In 2006 the first LNT-based application has been launched complying with tier 2 bin 8 standards.


In this paper we discuss the main development approaches for NOx-control for the Volkswagen Jetta 2.0L TDI which complies with the tier 2 bin 5 / LEV2 emission standards. Results from modelgas testing, engine bench characterization and vehicle testing will be presented.


The development of the LNT-based aftertreatment concept will be discussed in detail.


The main development goals for the LNT-formulation are a broadening of the temperature window, improvement of the thermal stability as well as a reduced desulfation temperature.


The introduction of new catalyst technologies require comprehensive system integration and optimization efforts which need to be addressed together by the OEM and its supplier.

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