| 摘要 |
<p>An exhaust gas-purifying apparatus includes an NOx sorbing-and-reducing first catalyst (A), a filter second catalyst (B), and an NOx sorbing-and-reducing third catalyst (C), which are disposed in an exhaust system in this order from a downstream side to an upstream side of a flow of exhaust gases. In the exhaust system, a liquid reducing agent is supplied into the exhaust gases intermittently. The first catalyst (A) exhibits a remarkably high NOx purifying ability, because not only the third catalyst (C) and the second catalyst (B) gasify, crack and homogenize the reducing gas fully but also the reactions at the third (C) and second catalysts (B) elevate the temperature of exhaust gases. Thus, the exhaust gas-purifying apparatus can purify PMs and NOx efficiently. <IMAGE></p> |
