Exhaust gas purifying catalyst composition and catalyst for purifying exhaust gases automobiles

Gasoline carbon monoxide in the exhaust gas discharged from an internal combustion engine (CO), hydrocarbons (HC), nitrogen oxides (NOx) exhaust gas purification catalyst composition excellent in purification performance of the exhaust gas for motor vehicles providing purifying catalyst. Rhodium particles (A) together with neodymium oxide particles (B) comprising a catalyst composition carried on the alumina (C), automobile carbon monoxide in the exhaust gas (CO), hydrocarbons (HC), nitrogen oxides ( a exhaust gas purification catalyst composition for purifying NOx), exhaust gas having an average particle diameter 100nm or less of neodymium oxide particles (B), characterized in that present as the shift suppressing material in the vicinity of the rhodium particles (a) provided by such purification catalyst composition.