Abstract
In this work, the catalytic activities of several single metallic oxides were studied for the treatment of propylene, a component in motorcycles' exhaust gases, under oxygen deficient conditions. Amongst them, CeO&sub2; is one of the materials that exhibit the highest activity for the oxidation of C&sub3;H₆. Therefore, several mixtures of CeO&sub2; with other oxides (SnO&sub2;, ZrO&sub2;, Co&sub3;O&sub4;) were tested to investigate the changes in catalytic activity (both propylene conversion and CO&sub2; selectivity). Ce0.9Zr0.1O&sub2;, Ce0.8Zr0.2O&sub2; solid solutions and the mixtures of CeO&sub2; and Co&sub3;O&sub4; was shown to exhibit the highest propylene conversion and CO&sub2; selectivity. They also exhibited good activities when tested under oxygen sufficient and excess conditions and with the presence of co-existing gases (CO, H&sub2;O).