【摘要】 以介孔为5.6 nm左右的有序介孔氧化硅（KIT-6）为硬模板,六水合硝酸镧、九水合硝酸铁及柠檬酸为混合前驱体,成功制备了高比表面积有序介孔LaFeO₃。采用X射线粉末衍射（XRD）、透射电镜（TEM）和氮气物理吸附等测试对所合成材料进行了细致表征。结果表明所合成的材料具有超细骨架尺寸（5 nm）、高的结晶度和有序介观结构,其比表面积高达286 m²/g,孔体积为0.5 cm³/g,孔径为5.9 nm左右。在内径4 mm的微型反应器内,对所合成有序介孔LaFeO₃进行了CO的催化氧化活性评估。测试结果表明有序介孔LaFeO₃具有较高CO催化氧化活性,显著优于体相LaFeO₃,在消除低浓度的CO气体方面有潜在应用价值。更多还原

【Abstract】 Ordered mesoporous LaFeO₃ perovskite oxide with high specific surface area has been successfully prepared by co-nanocasting method using ordered mesoporous silica（ KIT-6） with small pore of 5. 6 nm as hard template. The resultant mesoporous LaFeO₃ was characterized by X-ray diffraction（ XRD）,transmission electron microscope（ TEM） and nitrogen physical adsorption,which confirmed its ultrathin framework（ 5 nm） with high crystallinity and ordered mesoporous structure. The resultant mesoporous LaFeO₃ exhibited a high surface area of 286 m²/g,a high pore volume of 0. 5 cm³/g and an average pore diameter of 5. 9 nm. Catalytic performance of the resultant mesoporous LaFeO₃ for catalytically oxidizing carbon monoxide was evaluated in a micro-tube with inner diameter of 4 mm,which exhibited a higher activity than its bulky counterpart and could find potential application in eliminating low concentration CO gas.更多还原