Dual catalyst nitric oxide reduction

Details Dual catalyst nitric oxide reduction Dual catalyst nitric oxide reduction

1978-05-18

1979-05-22

Peters, G. O.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

423239, 422115, 422171, 422173, 60288, B01D 5300

Patent

active

041559860

ABSTRACT:
Exhaust gases from diesel and some other engines vary in temperature from about 100.degree. C. to about 800.degree. C. Exhaust is passed along with ammonia to a first reactor wherein the ammonia reduces nitric oxide at temperatures down to a threshold temperature between about 220.degree. C. to about 280.degree. C. Above this threshold temperature the effluent from the reactor is passed to the exhaust. When the first reactor effluent is at a temperature below the threshold temperature, it is passed through a second reactor after intermediate cooling, wherein it contacts an ammonium halide on activated charcoal catalyst at a temperature of 100.degree. C. to 170.degree. C., which catalyst catalizes the low temperature reduction of nitric oxide with ammonia.

REFERENCES:
patent: 3150922 (1964-09-01), Ashley
patent: 3222140 (1964-12-01), Scivally et al.
patent: 3961020 (1976-06-01), Seki
patent: 4031185 (1977-06-01), Akimoto et al.

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