| 摘要 |
<p>An exhaust emission control catalyst having superior NOx cleaning capability has υ and α phases and is constituted by modified alumina having an alpha ratio R represented by 0.5 % « R « 95 % and a catalytic metal carried on the modified alumina such as platinum Pt. In addition, a catalyst constituted by the above catalyst as a catalytic element and aluminosilicate or CeO2 also has a superior NOx cleaning capability.</p> |
