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以γ-Al2O3为载体,以MnxCe1-xO2为催化活性组分,采用浸渍法制备了一系列负载型MnxCe1-xO2/γ-Al2O3催化剂(x=0、0.2、0.4、0.6、0.8、0.9、1),在固定床反应器中评价了催化剂对甲苯的催化燃烧性能。结果表明,MnxCe1-xO2/γ-Al2O3催化剂的催化活性与催化剂的焙烧温度、活性组分MnxCe1-xO2的负载量以及Mn、Ce摩尔比有显著关系,其中焙烧温度550℃、负载量为20%、Mn、Ce摩尔比为4∶1时,即Mn0.8Ce0.2/γ-Al2O3催化剂对甲苯的催化性能最佳,反应温度为180℃时,甲苯的转化率达到95%。并在连续100 h的稳定性操作后,催化剂的活性基本无变化。采用XRD、BET以及SEM等分析测试手段对催化剂的结构以及表面进行了表征。
A series of supported MnxCe1-xO2 / γ-Al2O3 catalysts were prepared by impregnation using γ-Al2O3 as support and MnxCe1-xO2 as catalyst active component (x = 0,0.2,0.4,0.6,0.8,0.9,1 ), The catalytic combustion performance of the catalyst for toluene was evaluated in a fixed bed reactor. The results show that the catalytic activity of MnxCe1-xO2 / γ-Al2O3 catalyst has a significant relationship with the calcination temperature of catalyst, the loading of MnxCe1-xO2 and the molar ratio of Mn and Ce. The calcination temperature is 550 ℃ and the loading is 20% When the molar ratio of Mn and Ce is 4:1, the catalytic performance of Mn0.8Ce0.2 / γ-Al2O3 for toluene is the best. When the reaction temperature is 180 ℃, the conversion of toluene reaches 95%. After 100 hours of continuous operation, the activity of the catalyst remained almost unchanged. The structure and surface of the catalyst were characterized by XRD, BET and SEM.