LaCeCuMn/γ-Al_2O_3纳米稀土催化剂的制备及性能研究  

Preparation of nano-catalyst of LaCeCuMn rare earth oxides on γ-Al_2O_3 and its catalytic activity

作　　者：李玉静[1] 张鹏远 陈建峰[1] 

机构地区：[1]北京化工大学教育部超重力工程研究中心,北京100029

出　　处：《北京化工大学学报（自然科学版）》2005年第6期27-30,35,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家863计划(2002AA302605)

摘　　要：以纳米纤维状γ-Al2O3为载体,采用工艺路线简单的浸渍法制备了LaxCe1-xCuMn纳米稀土催化剂,并应用微反活性评价装置测试了对CO和C3H8的氧化活性.利用XRD,TEM,BET等手段,分析了产品的结构和粒子形貌.实验结果表明,催化剂活性组分在载体上分散比较均匀,平均粒径在15～20nm之间,为纳米级催化剂.La物质的量为0.4mol、活性组分质量分数为15.04%时,制得了较为纯净的钙钛矿催化剂,CO和C3H8氧化反应中起燃温度分别可以达到161,186℃,且二者的最终转化率均在99%以上.A series of rare-earth oxides LaxCe1- xCuMn/γ-Al2O3 supported catalysts were prepared by impregnation methods. Taking CO and G3H8 oxidation as a probe reaction, the different x values and active component loadings on the catalyst for CO and G3H8 oxidation were investigated. The experimental results demonstrate that the catalysts （x = 0.4 and amount of active component= 15.04% ） have a lower light-off temperature, and the CO and C3H8 conversion is above 99%. These catalysts were characterized by means of XRD, TEM and BET techniques to verify the species present in the catalysts. The results show that this catalyst has a high surface area, and the size of the active component is much smaller than nanoscale, and is highly dispersed on the nanofibrous γ-Al2O3.

关 键 词：钙钛矿型催化剂 纳米 CO和C3H8的氧化 

分 类 号：TQ133.3[化学工程—无机化工]