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1669356 
Journal Article 
A catalytic NOx management system for lean burn engines 
Feeley, J; Deeba, M; Farrauto, RJ 
1998 
1 
Studies in surface science and catalysis
ISSN: 0167-2991 
STUDIES IN SURFACE SCIENCE AND CATALYSIS 
116 
529-536 
WOS:000074776800050 
A new system, designed specifically for diesel engines, composed of a NOx adsorbent trap coupled to a lean NOx reduction catalyst is described. The trap adsorbs NOx between 150 and 500 degrees C which is periodically desorbed thermally by a localized exotherm generated within the catalyst from the controlled injection and oxidation of diesel fuel (always maintaining the exhaust lean). The hydrocarbon injection temperature is controlled to allow for a downstream lean-NOx Pt catalyst to reduce the desorbed NOx. Significant increases in NOx reduction are possible.



The trap has good thermal stability but suffers from deactivation by sulfur oxides. 
NOx trap/catalyst system; lean burn engines; NOx reduction