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LaxCe1-xMnO/γ-Al2O3催化剂的制备及其催化燃烧甲苯的性能

Keywords: 催化燃烧,稀土共掺,负载型催化剂,甲苯

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Abstract:

为了研究镧、铈2种稀土元素共掺金属氧化物催化剂对甲苯的去除效果,采用等体积浸渍法制备了LaxCe1-xMnO/γ-Al2O3稀土改性催化剂。考察了活性组分负载量、焙烧温度对催化剂催化活性的影响,确定了催化剂的最佳制备工艺。同时对镧、铈两种稀土元素不同原子配比对催化活性的影响进行研究。实验结果表明,LaxCe1-xMnO负载量为12%,催化剂的焙烧温度为450℃,La、Ce物质的量比为4∶1,制得的催化剂催化活性最强,催化效率最高,在6000h-1空速下,反应温度为320℃时即可将甲苯气体完全燃烧。运用BET、XRD、SEM、XRF等方法对催化剂的结构进行表征,结果表明,催化剂表面活性组分具有高分散性,氧化物颗粒粒径均一且分散均匀。稀土共掺催化剂与单一稀土改性催化剂相比,活性组分易于负载在载体表面,负载效果有着显著的提高。

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