Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1996-04-26
1999-12-21
Langel, Wayne
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
502302, 502303, 502328, 502330, B01D 5394, B01J 2358, B01J 2363
Patent
active
060045213
ABSTRACT:
A catalyst for purifying exhaust gases includes a heat resistant support, a porous layer coated on the heat resistant support, a noble metal catalyst ingredient loaded on the porous layer, and an NO.sub.x storage component including at least one member selected from the group consisting of alkaline-earth metals, rare-earth elements and alkali metals, and loaded on the porous layer. In the catalyst, the noble metal catalyst ingredient and the NO.sub.x storage component are disposed adjacent to each other, and are dispersed uniformly in the porous layer. In fuel-lean (i.e., oxygen-rich) atmospheres, NO present in exhaust gases is oxidized to NO.sub.2 by the noble metal catalyst ingredient, and at the same time the resulting NO.sub.2 is stored in the NO.sub.x storage component which is disposed adjacent to the nobel metal catalyst. In the stoichiometric or fuel-rich (i.e., oxygen-lean) atmospheres, the stored NO.sub.2 is released, and simultaneously urged to react with HC and CO present in exhaust gases by the action of the noble metal catalyst ingredient which is disposed adjacent to the NO.sub.x storage component. Hence, the catalyst is improved in terms of NO.sub.x purifying performance.
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Kasahara Koichi
Miyoshi Naoto
Tanizawa Tuneyuki
Tateishi Syuji
Cataler Industrial Co. Ltd.
DiMauro Peter
Langel Wayne
Toyota Jidosha & Kabushiki Kaisha
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