Process and assembly for eliminating nitrogen oxides present in

Details Process and assembly for eliminating nitrogen oxides present in Process and assembly for eliminating nitrogen oxides present in

1998-06-16

2000-02-01

Ryznic, John E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60287, 60297, 60301, F01N 320, F01N 328

Patent

active

060189436

ABSTRACT:
A process and an assembly for eliminating nitrogen oxides (NO.sub.x) present in the exhaust gas of a lean-burn diesel or spark-ignition engine, is part of the exhaust line coming from the engine. At least one nitrogen oxides conversion catalyst is placed in the main exhaust line the catalysts having non-coinciding temperature ranges for which the NO.sub.x conversion is below a certain conversion coefficient (C.sub.min). At least one NO.sub.x trap placed upstream is the conversion catalyst(s) and intended to trap, then to release the nitrogen oxides. At least one line bypassing the main exhaust line contains at least one of the NO.sub.x trap(s); and at least one valve intended to modulate the flow of gas between the bypass line and the main exhaust line is provided so that the NO.sub.x trap(s) can trap the nitrogen oxides, notably when conversion catalyst(s) have a conversion coefficient below a predetermined value (C.sub.min) and so that said the NO.sub.x trap(s) means (4) can release the nitrogen oxides simultaneously with a conversion.

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