Process for lowering nitrogen oxide levels in combustion engine

Details Process for lowering nitrogen oxide levels in combustion engine Process for lowering nitrogen oxide levels in combustion engine

1997-12-22

1999-12-14

Langel, Wayne

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

4232391, 4232132, 4232135, 60274, 60286, 60301, B01D 4700, B01J 800, F01N 300, F01N 310

Patent

active

060013184

ABSTRACT:
A process is disclosed for lowering nitrogen oxide levels in combustion engine exhaust gas by a reduction catalyst and by controlling the exhaust gas temperature upstream from the catalyst to a constant value, at which the catalyst exhibits maximum conversion for nitrogen oxides. It is possible to maintain maximum conversion over a wide range of engine outlet temperatures of the exhaust gas.

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patent: 5404719 (1995-04-01), Araki et al.
patent: 5517848 (1996-05-01), Hosoya et al.
patent: 5645804 (1997-07-01), Sumiya et al.

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