| 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 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 x purifying performance even after a durability test and to stably and efficiently purify NO x during the fuel-lean side (i.e., the oxygen-rich atmospheres) driving. |