Process for reducing an eliminating nitrogen oxides in an exhaus

Details Process for reducing an eliminating nitrogen oxides in an exhaus Process for reducing an eliminating nitrogen oxides in an exhaus

1978-07-19

1982-09-28

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423235, 423402, B01D 5336

Patent

active

043518117

ABSTRACT:
The concentrations of NO and NO.sub.2 in nitrogen oxides contained in an exhaust gas are adjusted to substantially equal mol concentrations, whereupon the exhaust gas is held in contact with a metallic oxide catalyst together with ammonia. Owing to the adjustment of the NO and NO.sub.2 concentrations in the nitrogen oxides, the reaction rate is enhanced, and the nitrogen oxides are reduced even at a low temperature. The adjustment of the concentrations of NO and NO.sub.2 in the nitrogen oxides is done by the oxidation of NO with ozone, the catalytic oxidation of NO with air or oxygen, the addition of nitric acid, the addition of NO or NO.sub.2, etc.

REFERENCES:
patent: 3453071 (1969-07-01), Schmitt et al.
patent: 4024219 (1977-05-01), Takahashi
patent: 4085193 (1978-04-01), Nakajima et al.
Svortsov et al., "The Soviet Chemical Industry", vol. No. 6, 1970, pp. 45-48.

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