| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an emission gas purification catalyst which has a high purification capability and enables a maintenance of a high catalyst activity even under air-fuel ratio fluctuation, and a manufacturing method of the emission gas purification catalyst which can manufacture easily the emission gas purification catalyst high in catalyst purification capability. <P>SOLUTION: The catalyst contains a carrier 2 formed of an inorganic oxide, a noble metal particle 3 existing in the carrier 2, and a promoter particle 4 arranged inside the carrier 2 in a state contacting with at least a part of the noble metal particle 3, and formed of the oxide having an oxygen electrochemically doping and dedoping capacity, an average particle diameter of the noble metal particle 3 being to be ≥2 nm and ≤10 nm. <P>COPYRIGHT: (C)2007,JPO&INPIT |
