Patent ID: 8569198

Claim:
An exhaust gas-purifying catalyst comprising: first particles of oxygen storage material; second particles of one or more alkaline-earth metal elements and/or compounds thereof interposed between the first particles; and third particles of one or more precious metal elements interposed between the first particles, wherein a spectrum of a first characteristic X-ray intensity for one of the one or more alkaline-earth metal elements and a spectrum of a second characteristic X-ray intensity for one of the one or more precious metal elements are obtained by performing a line analysis using energy-dispersive X-ray spectrometry along a line having a length of 500 nm, and a correlation coefficient σ(AE,PM) calculated from a mean value I AE (Av) of the first characteristic X-ray intensity and a mean value I PM (Av) of the second characteristic X-ray intensity obtained along the line having a length of 500 nm, respectively, and a mean value I AE (n) of the first characteristic X-ray intensity and a mean value I PM (n) of the second characteristic X-ray intensity that are obtained for an n-th interval of 25 intervals arranged in the line and each having a length of 20 nm, respectively, is 0.70 or more.