Innovative NOx-Storage Catalyst Systems for Spray-guided Gasoline Direct Injection Engines

Authors

Dipl.-Ing. W. Müller, Dr.phil.nat. U. Göbel, Dr.-Ing. T. Kreuzer, Dr.rer.nat. J. Leyrer, Dipl.-Ing. A. Matutt, Umicore AG & Co. KG, Hanau-Wolfgang

Year

2006

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 622

Summary

The focus for the advancement of future power train concepts is apart from the further reduction of the exhaust gas emissions also in the decrease of the fuel consumption and thus the CO2 – emissions with driving fun rising at the same time. For gasoline engines a high fuel economy benefit can be realized with the stratified, spray guided gasoline direct injection technology. A substantial success factor represents here the development of an innovative exhaust gas after treatment concept. From the possible technologies for the reduction of nitrogen oxides in lean exhaust gas the NOx storage catalyst technology became generally accepted for gasoline engines with gasoline direct injection. The most important development target for NOx storage catalysts is apart from the extension of the active temperature window the improvement of high temperature stability. The width of the dynamic NOx storage window after aging decides directly on which ranges an optimal engine operation is possible. This is essential for the utilization of the best fuel economy. In this contribution the systematic development steps are described for the series introduction of an exhaust gas after treatment concept with NOx storage catalysts for stratified, spray guided gasoline direct injection engines.

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