| 摘要 |
<p>Even in a vehicle with travel pattern of continuing operational status with low exhaust temperature, a satisfactory NO x reduction effect can be attained even at exhaust temperature lower than that required conventionally therefor. In an exhaust emission control device with selective reduction catalyst 10 incorporated in an exhaust pipe 9, ammonia being added upstream of the catalyst 10 for reduction and purification of NO x , the device comprises an ammonia generator 12 with a vessel 15 for holding urea water 23a and with an electrode 16 for generation of ammonia 13a, 13b through action of plasma on the urea water 23a in the vessel, the ammonia 13a, 13b generated in the generator 12 being fed upstream of the catalyst 10.</p> |
