Lean-burn nox catalyst/nox trap system

Details Lean-burn nox catalyst/nox trap system Lean-burn nox catalyst/nox trap system

1995-12-08

1998-03-17

Kwon, John T.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60274, 4232137, F01N 300

Patent

active

057273855

ABSTRACT:
The invention is a catalyst system for purifying exhaust gases generated by a lean-burn internal combustion engine, particularly automotive engines. The catalyst system comprises two separate components located in the exhaust gas passage, the first being a lean-burn nitrogen oxide catalyst and the second being a nitrogen oxide trap material, where the lean-burn NOx catalyst is located upstream of the NOx trap material in the exhaust gas passage. Preferably the catalyst comprises a transition metal such as copper, chromium, iron, cobalt, or manganese loaded on a refractory oxide or exchanged into a zeolite. The NOx trap preferably comprises (i) at least one precious metal selected from platinum and palladium loaded on a porous support; and (ii) at least one alkali metal or alkaline earth metal (a) loaded on a porous support or (b) present as an oxide thereof. Optionally the catalyst system may further comprise a three-way catalyst located either between the two-components or after the NO.sub.x trap material.

REFERENCES:
patent: 5351792 (1994-10-01), Kotoh et al.
patent: 5402641 (1995-04-01), Katoh et al.
patent: 5404719 (1995-04-01), Araki et al.
patent: 5412945 (1995-05-01), Katoh et al.
patent: 5472673 (1995-12-01), Goto et al.
patent: 5474745 (1995-12-01), Fukui et al.
patent: 5546921 (1996-08-01), Uchikawa

Affiliated with

Also associated with

Rating

Lean-burn nox catalyst/nox trap system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lean-burn nox catalyst/nox trap system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lean-burn nox catalyst/nox trap system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-948566