高比表面积有序介孔LaFeO3的制备及其在CO催化氧化中的应用  

Ordered Mesoporous LaFeO 3 with High Specific Surface Area for Catalytically Oxidizing Carbon Monoxide

作　　者：杨晓梅[1] 周次贵 薛屏[1] YANG Xiao-mei;ZHOU Ci-gui;XUE Ping(State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,School of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021

出　　处：《辽东学院学报（自然科学版）》2020年第3期153-158,共6页Journal of Eastern Liaoning University:Natural Science Edition

基　　金：国家自然科学基金项目(21961028)。

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LaFeO 3。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 m 2/g,孔体积为0.5 cm 3/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LaFeO 3进行了CO的催化氧化活性评估。测试结果表明有序介孔LaFeO 3具有较高CO催化氧化活性,显著优于体相LaFeO 3,在消除低浓度的CO气体方面有潜在应用价值。Ordered mesoporous LaFeO 3 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 LaFeO 3 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 LaFeO 3 exhibited a high surface area of 286 m 2/g,a high pore volume of 0.5 cm 3/g and an average pore diameter of 5.9 nm.Catalytic performance of the resultant mesoporous LaFeO 3 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.

关 键 词：介孔LaFeO 3 钙钛矿氧化物 大比表面积 CO的氧化反应 

分 类 号：TQ133[化学工程—无机化工]