Exhaust system for lean burn IC engines

Details Exhaust system for lean burn IC engines Exhaust system for lean burn IC engines

2007-02-20

2007-02-20

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S274000, C060S286000, C060S295000, C060S297000, C060S303000, C422S170000, C422S172000, C422S177000

Reexamination Certificate

active

10526511

ABSTRACT:
An exhaust system (10) for a lean-burn internal combustion engine comprises a nitrogen oxide (NOx) absorbent (28), a catalyst (30) for catalyzing the selective catalytic reduction (SCR) of a NOxwith a NOxspecific reactant, first means (18, 22) for introducing a NOxspecific reactant or a precursor thereof into an exhaust gas upstream of the SCR catalyst (30) and means (24) for controlling the introduction of the NOx-specific reactant or precursor thereof into the exhaust gas via the first introducing means (18, 22), wherein the SCR catalyst (30) is disposed upstream of the NOxabsorbent (28) and optionally with the NOxabsorbent, wherein the control means (24) is arranged to introduce the NOx-specific reactant or the precursor thereof to exhaust gas via the first introducing means (18, 22) only when the SCR catalyst (30) is active, whereby exhaustion of NOx-specific reactant to atmosphere is substantially prevented.

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