Process for reducing nitrogen oxides

Details Process for reducing nitrogen oxides Process for reducing nitrogen oxides

1994-10-20

1996-08-06

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

4232135, B01J 802

Patent

active

055431240

ABSTRACT:
A process for efficiently reducing nitrogen oxides in exhaust gases including excess oxygen. The process includes intermittently introducing a reducing agent, such as hydrogen and carbon monoxide, for reducing nitrogen oxides to a reducing catalyst, such as platinum, disposed in an exhaust gas passage while maintaining an oxygen excess condition. The reducing agent is intermittently introduced in a manner to satisfy the following equation:
[NO.sub.x ]<[H.sub.2 ]+[CO], wherein [H.sub.2 ], [CO] and [NO.sub.x ] are molar concentrations of hydrogen, carbon monoxide and nitrogen oxides, respectively. The reducing catalyst may include a transition metal, an alkaline metal and/or an alkaline earth metal.

REFERENCES:
patent: 4117081 (1978-09-01), Inaba et al.
patent: 4963332 (1990-10-01), Brand et al.
patent: 5023063 (1991-06-01), Stiles
patent: 5041270 (1991-08-01), Fujitani et al.
patent: 5272871 (1993-12-01), Oshima et al.
Patent Abstracts of Japan, JP-A-62 097 630, May 7, 1987.
Patent Abstracts of Japan, JP-A-01 139 145, May 31, 1989.
Patent Abstracts of Japan, JP-A-05 168856, Jul. 2, 1993.
Patent Abstracts of Japan, JP-A-05 168 860, Jul. 2, 1993.
Patent Abstracts of Japan, JP-A-54 090 064, Jul. 17, 1979.
Patent Abstracts of Japan, JP-A-03 199 640, Aug. 30, 1991.
Patent Abstracts of Japan, JP-A-04 284 117, Oct. 8, 1992.

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