Research Results on Processes and Catalyst Materials for Lean NOx Conversion

Axel König; Thomas Richter; Edward Jobson; Michael Preis; Emanuele Leveroni; Bernd Krutzsch; Rémi Noirot; Michèle Chevrier

doi:10.4271/962041

1996-10-01

Research Results on Processes and Catalyst Materials for Lean NOx Conversion 962041

In a joint research project between industrial companies and a number of research institutes, nitrogen oxide conversion in oxygen containing exhaust gas has been investigated according to the following procedure

Basic investigations of elementary steps of the chemical reaction
Production and prescreening of different catalytic material on laboratory scale
Application oriented screening of industrial catalyst material
Catalyst testing on a lean bum gasoline engine, passenger car diesel engines (swirl chamber and DI) and on a DI truck engine

Although a number of solid body structures show nitrogen oxide reduction by hydrocarbons, only noble metal containing catalysts and transition metal exchanged zeolites gave catalytic efficiencies of industrial relevance. A maximum of 25 % NOx reduction was found in the European driving cycle for passenger cars, about 40 % for truck engines in the respective European test.

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Research Results on Processes and Catalyst Materials for Lean NOx Conversion 962041

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