Process for purifying exhaust gases

Details Process for purifying exhaust gases Process for purifying exhaust gases

1997-03-10

1999-10-19

Langel, Wayne

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

423212, 4232135, B01D 5394

Patent

active

059684623

ABSTRACT:
A process includes the step of bringing exhaust gases into contact with a catalyst, wherein the catalyst includes a support including a porous substance, at least one NO.sub.x adsorbent loaded on the support, and selected from the group consisting of alkaline-earth metals, rare-earth elements and alkali metals, and at least one element loaded on the support, and selected from the group consisting of copper and cobalt. The process enables the catalyst to exhibit superb NO.sub.x purifying performance even after a durability test and to stably and efficiently purify NO.sub.x during the fuel-lean side (i.e., the oxygen-rich atmospheres) driving.

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