PARTICULATE SUBSTANCE REMOVING MATERIAL, PARTICULATE SUBSTANCE REMOVING FILTER CATALYST USING PARTICULATE SUBSTANCE REMOVING MATERIAL, AND METHOD FOR REGENERATING PARTICULATE SUBSTANCE REMOVING FILTER CATALYST

摘要

A particulate matter purifying material is used for a filter catalyst for purifying particulate matter that is disposed in an exhaust gas flow path of an internal combustion engine, traps the particulate matter in exhaust gas generated in the internal combustion engine, and burns the particulate matter to be deposited, so as to be regenerated. The particulate matter purifying material includes an oxide containing cerium (Ce) having an oxygen storage-release capacity, and at least one metal (Me) selected from the group consisting of Zr, Y, La, Pr, Sr, Nb and Nd, wherein a content ratio (Ce:Me) of cerium to the metal is 6:4 to 9:1 in terms of an atomic ratio, and a degree of crystallinity (CR) represented by the following formula (1) is within a range of 25 to 60%: Degree of crystallinity CR = I / I 0 × 100 % wherein I represents an X-ray diffraction peak intensity with regard to a (111) plane of a CeO 2 phase in the particulate matter purifying material, and I 0 represents the X-ray diffraction peak intensity with regard to the (111) plane of the CeO 2 phase after the particulate matter purifying material is baked in air at 1000 °C.