Development of Low Temperature Catalytic Oxidation Processes Using Ozone

比较了锰氧化物和第一过渡系金属氧化物对臭氧氧化苯的催化性能。二氧化硅负载的锰氧化物比其他金属氧化物具有更高的活性。臭氧在苯的催化氧化中得到了有效的消耗。在臭氧氧化苯的过程中，最重要的步骤是在苯氧化形成的催化剂上生成和氧化副产物化合物。氧化锰上的副产物迅速氧化成CO_2和CO。另一方面，铁、钴、镍和铜的氧化物由于副产物化合物的积聚和对副产物化合物的低氧化活性而使催化剂失活。因此，锰氧化物对苯氧化的高活性归因于催化剂上的副产物化合物容易被氧化。

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.