| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device for controlling exhaust emission which excellently removes NOx contained in exhaust gas using urea water and reduces the size. <P>SOLUTION: The device for controlling exhaust emission 101 includes: a first oxidation catalyst layer 12 provided in a passage through which exhaust gas flows; a DPF body 13D on the downstream of the first oxidation catalyst layer 13D; a SCR catalyst 14 integrally formed with the DPF body 13D and having ammonia adsorption property; a second oxidation catalyst 15 integrally formed with the DPF body 13D and oxidizing ammonia at a predetermined temperature or higher; and an injection valve 18 on the upstream of the SCR catalyst 14 for supplying urea water. The injection valve 18 supplies urea water only when the temperature of the second oxidation catalyst 15 is below the predetermined temperature. <P>COPYRIGHT: (C)2011,JPO&INPIT |
