EXHAUST EMISSION CONTROL CATALYST DEVICE AND EXHAUST EMISSION CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To efficiently adsorb various HC having different carbon numbers in exhaust gas, and to purify the same.

SOLUTION: HC in the exhaust gas is cracked by a cracking catalyst 2. HC in the exhaust gas passing through the cracking catalyst 2 is adsorbed while being divided to an HC adsorbent 6a preferentially adsorbing the HC of a high carbon number and an HC adsorbent 6b preferentially adsorbing the HC of a low carbon number. HC desorbing from the HC adsorbent 6a preferentially adsorbing the HC of the high carbon number is purified by a three-way catalyst 7a with a large quantity of catalyst metal or an oxygen occluding material, and HC desorbing from the HC adsorbent 6b preferentially adsorbing the HC of the low carbon number is purified by a three-way catalyst 7b with a small quantity of catalyst metal or the oxygen occluding material.

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