Method for catalytic reduction of nitrogen oxides

Details Method for catalytic reduction of nitrogen oxides Method for catalytic reduction of nitrogen oxides

2005-08-01

2010-02-23

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

C423S213500, C423S239100, C060S274000, C060S282000, C060S299000, C060S301000

Reexamination Certificate

active

07666375

ABSTRACT:
A method comprising subjecting fuel to combustion while the combustion atmosphere of the fuel is oscillated periodically and alternately between rich and lean conditions, leading the exhaust gas formed to a catalytic reactor, and bringing the exhaust gas into contact with a catalyst in the catalytic reactor to conduct catalytic reduction of nitrogen oxides contained in the exhaust gas, wherein the catalyst comprises as catalyst components:(A) an oxide catalyst component A comprising(a) ceria or(b) praseodymium oxide or(c) a mixture of oxides and/or a composite oxide of at least two elements selected from cerium, zirconium, praseodymium, neodymium, terbium, samarium, gadolinium and lanthanum; and(B) (d) a noble metal catalyst component B selected from platinum, rhodium, palladium and oxides thereof;under an oxygen concentration adjusted to the range of 0.1-1.0% at the exit of the catalytic reactor under the rich conditions.

REFERENCES:
patent: 5008090 (1991-04-01), Joy et al.
patent: 2004/0043897 (2004-03-01), Tadao
patent: 2007/0274889 (2007-11-01), Nakatsuji et al.
patent: 2008/0219906 (2008-09-01), Chen et al.
patent: 2009/0041644 (2009-02-01), Wassermann
patent: 2003-305342 (2003-10-01), None
patent: 2004-092607 (2004-03-01), None
patent: 2004-209386 (2004-07-01), None

Affiliated with

Also associated with

Rating

Method for catalytic reduction of nitrogen oxides 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 for catalytic reduction of nitrogen oxides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for catalytic reduction of nitrogen oxides will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4160799