| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device sufficiently purifying NOx, HC, H<SB>2</SB>and PM. <P>SOLUTION: This exhaust emission control device 1 is disposed in the middle of the exhaust gas flow passage 19 of an internal combustion engine. The exhaust emission control device 1 includes porous base members 2, 3, and a PM combustion catalyst and a NOx reduction catalyst which are supported on the base members 2, 3. The PM combustion catalyst is formed by calcining a mixture of an alkali metal element source and/or an alkaline earth metal element source and zeolite, or sodalite at 600°C or more. In the NOx reduction catalyst, a metal element of a group 6-11 or a metal compound containing the metal element is supported on a proton conductor composed of a compound represented by general formula: M1<SB>x</SB>×M2<SB>1-x</SB>P<SB>2</SB>O<SB>7</SB>(M1 represents a tetravalent metal element, M2 represents a trivalent metal element, and 0.5≤X≤1). The PM combustion catalyst is arranged upstream of the NOx reduction catalyst in the exhaust gas flow passage 19. <P>COPYRIGHT: (C)2011,JPO&INPIT |
