Method and apparatus for purifying exhaust gases from internal c

Details Method and apparatus for purifying exhaust gases from internal c Method and apparatus for purifying exhaust gases from internal c

1995-03-01

1996-09-17

Warden, Robert

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

423212, 4232132, 422169, 422170, 422171, 422177, 60274, F01N 300

Patent

active

055566049

ABSTRACT:
A method, and an apparatus for carrying out the method, for purifying exhaust gases from internal combustion engines is provided. The engines having a catalyzer system which includes a first catalyzer and at least one second catalyzer, arranged downstream of the first catalyzer, for the conversion of HC, CO and NO.sub.x exhaust gas constituents. Exhaust gases flow through both catalyzers during the entire operating period of the engine. The first catalyzer is suitable for at least the catalytic conversion of HC and CO exhaust gas constituents. In a first step of the method, the first catalyzer is operated over-stoichiometrically during the cold starting phase in order to reduce the HC and CO emissions and, in a second step of the method with .lambda.-controlled stoichiometric exhaust gas composition, the catalytic conversion of the exhaust gas is at least largely de-activated and in the first catalyzer takes place in the second catalyzer. Substantially better endurance of the first catalyzer is attained for the same good reduction in the exhaust gas pollutants.

REFERENCES:
patent: 5010051 (1991-04-01), Rudy
patent: 5051244 (1991-09-01), Dunne et al.
patent: 5113651 (1992-05-01), Kotzan et al.
patent: 5235956 (1993-08-01), Yoshizaki
Patent Abstract of Japan, Japanese No. 4-287820, M-1371 Feb. 23, 1993, vol. 17/No. 92.

Affiliated with

Also associated with

Rating

Method and apparatus for purifying exhaust gases from internal c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for purifying exhaust gases from internal c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for purifying exhaust gases from internal c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-411478