Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1998-02-23
1999-11-23
Bell, Mark L.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502324, 502325, 502328, 502332, 502333, 502334, 502335, 502336, 502337, 502338, 502339, 502340, 502341, 502327, 502355, B01J 2300, B01J 2302, B01J 2342, B01J 2356
Patent
active
059900385
ABSTRACT:
The invention relates to a first catalyst for purifying an exhaust gas. The first catalyst has a substrate and a catalytic coating formed thereon. This catalytic coating has first and second grains. The first grain includes a porous carrier supporting thereon at least one of palladium and rhodium. The second grain includes a double oxide supporting thereon at least one of platinum and palladium. This double oxide is represented by a formula of (La.sub.1-x A.sub.x).sub.1-.alpha. BO.sub..delta. where A is at least one element selected from barium, potassium and cesium, B is at least one of iron, cobalt, nickel and manganese, 0<X<1, 0<.alpha.<0.2, and .delta. is a number such that a net electric charge of the first double oxide becomes zero. The invention further relates to a second catalyst similar to the first catalyst. The first grain of the second catalyst includes a porous carrier supporting thereon at least one of platinum, palladium, rhodium and iridium. The second grain of the second catalyst includes a double oxide represented by a formula of (La.sub.1-x A.sub.x).sub.1-.alpha. BZr.sub..beta. O.sub..delta. where A, B, x, .alpha. and .delta. are defined as above and 0<.beta.<1. The first and second catalysts are each improved in NOx absorption capability and capable of purifying NOx contained in an oxygen rich exhaust gas, even after the passage of an exhaust gas of high temperature for a long time through these catalysts.
REFERENCES:
patent: 4748143 (1988-05-01), Tabata et al.
patent: 4849398 (1989-07-01), Takada et al.
patent: 5447705 (1995-09-01), Petit et al.
patent: 5559073 (1996-09-01), Hu et al.
patent: 5622680 (1997-04-01), Monceaux et al.
patent: 5691263 (1997-11-01), Park et al.
patent: 5736482 (1998-04-01), Durand et al.
patent: 5801114 (1998-09-01), Durand et al.
patent: 5811364 (1998-09-01), Suga et al.
patent: 5814576 (1998-09-01), Yamamoto
patent: 5821185 (1998-10-01), White et al.
Sekiba Toru
Suga Katsuo
Bell Mark L.
Hailey Patricia L.
Nissan Motor Co,. Ltd.
LandOfFree
Catalyst for purifying oxygen rich exhaust gas does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Catalyst for purifying oxygen rich exhaust gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Catalyst for purifying oxygen rich exhaust gas will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1221696