經由測試七種金屬氧化物觸媒催化焚
化芳香烴化合物，吾人發現奈米級CeO2
的催化作用是7種金屬中活性最好的。利用eO2觸媒，完全氧化甲苯溫度需達到240
。在焚化對-二甲苯時，有相似的結果，但是苯的焚化則較困難。在製備CeO2觸媒上，有四個不同的方法，其中以過氧化氫還原法製備的觸媒活性最好，所以後續研究均選擇該觸媒。在VOCs焚化反應中，欲將甲苯100%氧化，則在高的質量空間速率(weight hourly space velocity, WHSV)及高的甲苯濃度時，反應溫度亦需較高。CeO2觸媒耐用性頗佳，但有SO2存在時，會造成不可逆之活性衰減。 We tested the efficacy of a set of seven
metal oxide catalysts in the catalytic
incineration of aromatic hydrocarbons and
found nano-size CeO2 to be the most active
of the seven. Using CeO2, complete
oxidation of toluene was achieved at 240℃.
There was a similar outcome in the
incineration of p-xylene, whereas benzene
was more refractory. In preparation of the
CeO2 catalyst, four different methods were
evaluated and a redox reaction in hydrogen
peroxide was found to produce the most
active catalyst. Hence the most active CeO2
catalyst was used for the following tests. In
the reaction, a higher reaction temperature
was necessary for 100% conversion of
toluene at higher values of weight hourly
space velocity (WHSV) and higher toluene
concentrations. The stability of CeO2 was
excellent, although the presence of SO2
caused an irrecoverable decline in activity.
