| abstract |
The present invention addresses the problem of providing a porous structure for an exhaust gas purification catalyst, the porous structure having an excellent light-off performance. This porous structure for an exhaust gas purification catalyst includes an oxygen storage component and an inorganic porous body, and the ratio of the volume of a pore having a pore diameter not less than 15 nm but less than 25 nm to the volume of a pore having a pore diameter of not less than 5 nm but less than 15 nm is 1.3-2.5 in a pore volume distribution measured by a mercury penetration porosimeter. Preferably, there is at least one peak-top within the pore diameter range of not less than 15 nm but less than 25 nm. |