Development of Low Temperature Catalytic Oxidation Processes Using Ozone

将锰氧化物对臭氧氧化苯的催化性能与第一过渡系列金属氧化物的催化性能进行了比较。 SiO2负载的Mn氧化物比其他金属氧化物表现出更高的活性。臭氧在苯的催化氧化中被有效消耗。苯臭氧氧化中最重要的步骤是苯氧化中形成的催化剂上副产物化合物的形成和氧化。 Mn氧化物上的副产物化合物迅速氧化为CO2和CO。另一方面，Fe、Co、Ni和Cu氧化物由于副产物化合物的积累以及副产物化合物氧化活性低而遭受催化剂失活。因此，锰氧化物对苯氧化的较高活性归因于副产物化合物在催化剂上的容易氧化。

Catalytic properties of manganese oxides for benzene oxidation with ozone were compared with those of the oxides of metals in first transition series. SiO2-supported Mn oxides showed higher activity than other metal oxides. Ozone was efficiently consumed in catalytic oxidation of benzene. The most important steps in benzene oxidation with ozone are the formation and oxidation of byproduct compounds on catalysts formed in benzene oxidation. The byproduct compounds on Mn-oxide were rapidly oxidized to CO2and CO. On the other hand, Fe-, Co-, Ni-, and Cu-oxides suffered from catalyst deactivation due to the build-up of the byproduct compounds and their low activity for the oxidation of the byproduct compounds. Thus, the higher activity of Mn oxides for benzene oxidation is ascribed to the facile oxidation of the byproduct compounds on the catalysts.