| 摘要 |
A system for exhaust gas purification disposed in the exhaust pipe of an internal combustion engine, includes an adsorbent comprising a monolithic carrier and an adsorbent component having a hydrocarbon adsorptivity, loaded on the carrier, and a catalyst comprising a monolithic carrier and a catalyst component loaded on the carrier, having a purifiability for the harmful substances present in the exhaust gas emitted from the engine, the catalyst being provided downstream of the adsorbent in the flow direction of the exhaust gas. In the system, the adsorbent has a sectional shape satisfying the following relation: 1.2 ~ (major axis)/(minor axis) ~ 6.5 This system for exhaust gas purification enables the desorption of hydrocarbons from the adsorbent in a longer time and can remove the hydrocarbons generated during engine cold start, at a higher purification ratio.
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