Process for the reduction of the nitrogen oxides in exhaust gase

Details Process for the reduction of the nitrogen oxides in exhaust gase Process for the reduction of the nitrogen oxides in exhaust gase

1989-08-21

1990-08-07

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

423239, B01D 4700, B01J 800, C01B 2100

Patent

active

049466593

ABSTRACT:
An improvement in the removal of nitrogen oxides from the exhaust gases of internal combustion engines is achieved by adding urea or a urea-containing reducing agent to the exhaust gases and contacting the gases under oxidizing conditions with a zeolite containing catalyst.

REFERENCES:
patent: 3801696 (1974-04-01), Mark
patent: 3826810 (1974-07-01), Lawson
patent: 4104361 (1978-08-01), Nishikawa et al.
patent: 4119702 (1978-10-01), Azuhata et al.
patent: 4154803 (1979-05-01), Uchikawa et al.
patent: 4155986 (1979-05-01), Gladden
patent: 4473535 (1984-09-01), Kittrell et al.

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