| abstract |
To provide an exhaust gas purifying catalyst which cannmaintain the catalytic activity of Rh at a high level over anlong time and can achieve satisfactory emission controlnperformance, an exhaust gas purifying catalyst is prepared sonas to contain a composite oxide having a perovskite structurenrepresented by the general formula (1):n ABRhO 3 nwherein A represents at least one element selected from rare-earthnelements essentially including one or more rare-earthnelements each having a valence of 3 as the only valence andnarbitrarily including Ce and/or Pr; and B represents at leastnone element selected from transition elements excluding Co,nRh and the rare-earth elements, and Al. |