| 摘要 |
PURPOSE: An exhaust gas purification device is provided to improve the purification efficiency of NOx without reducing the production of nitrogen dioxide because catalyst is coated on the rear outer and end surfaces of a channel. CONSTITUTION: An exhaust gas purification device includes a first coating layer(210) and a second coating layer(215). In the first coating layer, catalyst is spread to a first length from an entrance(200) toward an exit(205) on the inside surface of a channel. In the second coating layer, catalyst is spread to a second length from the exit toward the entrance on the outer surface of the channel. Therefore, no catalyst is coated on the rear inner surface of the channel.
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