Controllable Synthesis of Pure-Phase Rare-Earth Orthoferrites Hollow Spheres with a Porous Shell and Their Catalytic Performance for the CO + NO Reaction
Controllable Synthesis of Pure-Phase Rare-Earth Orthoferrites Hollow Spheres with a Porous Shell and Their Catalytic Performance for the CO + NO Reaction
复制标题
DOI：
10.1021/cm101419w
复制
发表时间：
2010-08
影响因子：
8.6
通讯作者：
Xun Li;Changjin Tang;Man Ai;Lin Dong;Zhengqi Xu
中科院分区：
文献类型：
--
作者：
Xun Li;Changjin Tang;Man Ai;Lin Dong;Zhengqi Xu
采用水热法制备了一种柠檬酸稀土铁配合物前驱体，通过煅烧成功地合成了具有多孔壳和实心球（Ln = Dy−Yb，Y）的纯钙钛矿结构LnFeO 3（Ln = La，Pr−Tb）空心球。利用溶液中的反应物种分布图，可以计算出获得Ln/Fe = 1：1的柠檬酸镧铁配合物的反应参数。计算值与实验值吻合较好。采用元素分析、电感耦合等离子体分析（ICP）、能谱分析（EDS）、热重分析（TGA）、傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）等方法对柠檬酸稀土铁配合物的组成和热分解过程进行了研究。提出柠檬酸镧铁配合物空心球的形成机理为酸溶熟化过程。此外，13个纯相LnFeO 3微球均具有优异的介电性能。
Pure perovskite LnFeO3 (Ln = La, Pr−Tb) hollow spheres with porous shell and solid spheres (Ln = Dy−Yb, Y) have been successfully synthesized via calcination of a Ln-Fe citrate complex precursor, which was prepared via a convenient and effective hydrothermal method. The reaction parameters to obtain the Ln-Fe citrate complex with Ln/Fe = 1:1 can be calculated using a diagram of reaction species distribution in the solution. The calculated value was coincident well with the experimental one. The composition and the thermal decomposition processes of the Ln-Fe citrate complex were investigated carefully, using elemental analysis, inductively coupled plasma analysis (ICP), energy-dispersive spectroscopy (EDS), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The formation mechanism of the Ln-Fe citrate complex hollow spheres was proposed as an acidic digestion ripening process. Furthermore, all 13 pure-phase LnFeO3 microspheres had an excellent ca...