| abstract |
The present invention provides an exhaust gas purifying catalyst in which an alkaline earth metal is supported on a porous carrier in a highly dispersed state. The catalyst layer of the exhaust gas purifying catalyst provided by the present invention is an alkali comprising a porous carrier, a catalyst metal belonging to the platinum group, and at least one sulfate of an alkaline earth metal supported on the porous carrier. It has an earth metal bearing area, Regarding the cross section of the area, Pixel size 0.34 μm × 0.34 μm; Number of measured pixels 256 × 256; The surface analysis by FE-EPMA is carried out under the conditions described above, and the characteristic X-ray intensity (α: cps) of the alkaline earth metal element (Ae) and the main constituent element (M) of the inorganic compound constituting the porous carrier are The intensity (β: cps) of the characteristic X-ray of each pixel is measured for each pixel, and the Pearson's correlation coefficient RAe / M value calculated using α and β for each pixel is 0.5 or more. Is characterized by. |