Exhaust gas purification apparatus

An exhaust gas purification apparatus for purifying an exhaust gas discharged from the internal combustion engine and to be disposed in an exhaust passage of an internal combustion engine, the exhaust gas purification apparatus comprising:

• a substrate having a wall-flow structure, the substrate comprising:
• a porous partition that divides
• an entry-side cell in which only an exhaust gas inflow-side end part is open from
• an exit-side cell in which only an exhaust gas outflow-side end part is open;
• wherein
• the exit-side cell is adjacent to the entry-side cell;
• and
• the porous partition comprises:
• a first plurality of pores consisting of first pores having a first average pore diameter of not more than 10 μm measured by mercury porosimetry,
• a second plurality of pores consisting of second pores having a second average pore diameter of greater than 10 μm and not more than 100 μm measured by mercury porosimetry, where the second average pore diameter is larger than the first average pore diameter,
• a first catalyst region formed in the first pores, and
• a second catalyst region formed in the second pores, wherein
• the first catalyst region contains a first support and a first catalyst loaded on the first support, where the first catalyst is one or two metals selected from the group consisting of Pt, Pd, and Rh, and
• the second catalyst region contains a second support and a second catalyst loaded on the second support, wherein the second catalyst is a metal that is different from the one or two metals of the first catalyst with the proviso that the metal of the second catalyst is at least one metal selected from the group consisting of Pt, Pd, and Rh.