| 摘要 |
<p>Provided are: a catalyst composition for exhaust gas purification, which exhibits excellent performance in removing nitrogen oxides (NOx), carbon monoxide (CO) and carbon hydride (HC) in an exhaust gas that is discharged from an internal combustion engine such as a gasoline-powered vehicle; and an exhaust gas purifying catalyst for automobiles. A catalyst composition for exhaust gas purification for removing nitrogen oxides, carbon monoxide and carbon hydride in an exhaust gas, which contains a catalyst composition wherein rhodium is supported, together with alpha-alumina particles, by a zirconia base. This catalyst composition for exhaust gas purification is characterized in that the alpha-alumina particles have an average particle diameter of from 10 nm to 1 mum, said average particle diameter being smaller than the average particle diameter of the zirconia (ZrO2) base.</p> |
