Method for removing nitrogen oxides and particulates from...

Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...

Reexamination Certificate

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C060S274000, C060S286000, C060S301000, C060S303000, C060S311000

Reexamination Certificate

active

06938411

ABSTRACT:
A method for removing nitrogen oxides and particulate matter from the lean exhaust gas of a combustion engine that also contains low concentrations of sulfur oxides. The exhaust gas stream is passed over a nitrogen oxide storage catalyst and a particulate filter, where nitrogen oxides and sulfur oxides are adsorbed by the storage catalyst under lean exhaust gas conditions and the particulate matter is deposited on the particulate filter. The storage catalyst is in a first cycle is periodically denitrated by enriching the exhaust gas regeneration of the particulate filter. Desulfurization of the nitrogen oxide storage catalyst is carried out in a second cycle by raising the temperature of the lean exhaust gas to a value at which the particulate matter combustion on the particulate filter is initiated and then the storage catalyst can be desulfurized by enriching the exhaust gas.

REFERENCES:
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patent: 5746989 (1998-05-01), Murachi et al.
patent: 5850735 (1998-12-01), Araki et al.
patent: 5974791 (1999-11-01), Hirota et al.
patent: 6233927 (2001-05-01), Hirota et al.
patent: 6293096 (2001-09-01), Khair et al.
patent: 6314722 (2001-11-01), Matros et al.
patent: 198 35 565 (2000-02-01), None
patent: 198 50 757 (2000-02-01), None
patent: 0 758 713 (1997-02-01), None
patent: 0 976 915 (2000-02-01), None
patent: 0 976 915 (2000-02-01), None
European Search Report issued in corresponding European Application No. EP 01 10 9983.
German language Search Report (dated May 12, 2000).

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