| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the loadability of an oxidation catalyst onto a vehicle or the like and maintain the activity of the oxidation catalyst, for a long period of time, to variations in temperature of an exhaust gas from an engine. <P>SOLUTION: An oxidation catalyst 19 includes: a cylindrical carrier 19a whose both ends are open and in which a plurality of cells 19b extending in an exhaust gas flowing direction are formed; and an active substance held by the carrier 19a. In this case, L/D is set to be in a range of 0.5-4, wherein L represents the length of the oxidation catalyst 19, and D represents its diameter. Furthermore, the densities of the cells 19b of the oxidation catalyst 19 are set to be in a range of 600-3,900 pieces/cm<SP>2</SP>, and the thicknesses of the partitions 19c which partition the plurality of cells 19b are set to be in a range of 20-320 μm, and the volume of the oxidation catalyst 19 is set to be in a range of 20-150% in the case that the displacement of an engine is regarded as 100%. <P>COPYRIGHT: (C)2011,JPO&INPIT |
