溶胶-凝胶法制备La_(1-x)Sr_xFe_(1-y)M_yO_3(M=Co,Mn)催化剂

Preparation of La_(1-x)Sr_xFe_(1-y)M_yO2(M = Co, Mn) Catalysts by Sol-Gel Process

分别以EDTA(乙二胺四乙酸)和柠檬酸为螯合剂,用溶胶-凝胶法制备了钙钛矿型复合掺杂氧化物La1-xSrxFe1-xMyO3(M=Co,Mn)催化剂粉体。通过热分析(TG-DTA)和X射线衍射分析确定了焙烧温度,并采用X射线衍射分析(XRD)、扫描电镜(SEM)、激光粒度分析和氧程序升温热脱附(O2-TPD)等技术对材料进行了表征分析。X射线衍射分析结果表明:制备的材料为单相钙钛矿氧化物粉末,无简单氧化物或其他杂相生成;扫描电镜和激光粒度分析等表明粉末样品粒度小且分散性和均匀性好;氧程序升温热脱附结果初步表明合成的钙钛矿型复合氧化物结构中具有表面弱吸附氧、氧空位吸附氧以及晶格氧3种氧物种。

Perovskite-type oxides La1-xSrxFe1-yMyO3 (M = Co, Mn) powder catalysts were synthesized by complexing sol-gel process. The productions were characterized via XRD, SEM, laser granularity analysis and O2-TPD. Single-phased, uniform perovskite-type oxides powder with small particle size were obtained by sol-gel process, and the process temperature is much lower than that in solid state reaction method. XRD patterns show that all the powder samples are perovskite-type compounds and no simple metal oxides or any other secondary phase exits. The results of SEM and laser granularity analysis show uniform perovskite-type oxides powder with small particle size were obtained. From O2-TPD curves, there are potential three types of oxygen in the structure.