Ceo(2) Based Catalysts for the Treatment of Propylene in Motorcycle’s Exhaust Gases

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(2) is one of the materials that exhibit the highest activity for the oxidation of C(3)H(6). Therefore, several mixtures of CeO(2) with other oxides (SnO(2), ZrO(2), Co(3)O(4)) were tested to investigate the changes in catalytic activity (both propylene conversion and CO(2) selectivity). Ce(0.9)Zr(0.1)O(2), Ce(0.8)Zr(0.2)O(2) solid solutions and the mixtures of CeO(2) and Co(3)O(4) was shown to exhibit the highest propylene conversion and CO(2) selectivity. They also exhibited good activities when tested under oxygen sufficient and excess conditions and with the presence of co-existing gases (CO, H(2)O).