Preparation and morphology of nano-size ceria by a stripping precipitation using oxalic acid as a precipitating agent  

作　　者：梅燕 王为 孙何 聂祚仁 

机构地区：[1]College of Materials Science and Engineering,Beijing University of Technology

出　　处：《Journal of Rare Earths》2012年第12期1265-1269,共5页稀土学报（英文版）

基　　金：Project supported by the National High Technology Research and Development Program of China (863 Program) (2010AA03A407);Project of Beijing Educational Committee (PXM2012_014204_00_000160)

摘　　要：The precursors organic cerium deposits were obtained by a stripping precipitation method from cerium-loaded P507 organic phase using oxalic acid as a precipitating agent and nano-sized ceria particles were prepared by calcining the precursors at 500 ℃. The morphologies, phase structure of the precursors and ceria particles were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD）, thermogravimetric analysis （TG-DSC） and infrared spectroscopy analysis （FTIR）. The results indicated that the concentration of oxalic acid had a little impact on the morphology of the precursors, which was blocky-shape Ce2（C2O4）3：10H2O with a monoclinic lattice structure. With the volume ratio of organic phase and oxalic acid aqueous solution （aqueous phase） varied from 1：3 to 1：6, the morphologies of the precursors Ce2（C2O4）3· 10H2O precipitates gradually changed from inhomogeneous blocky-shape to uniform spherical particles. The precursors could be turned to CeO2 crystal particles with a fluorite structure by calcining, and the products ceria particles were similar in the size and morphology to the precursors.The precursors organic cerium deposits were obtained by a stripping precipitation method from cerium-loaded P507 organic phase using oxalic acid as a precipitating agent and nano-sized ceria particles were prepared by calcining the precursors at 500 ℃. The morphologies, phase structure of the precursors and ceria particles were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD）, thermogravimetric analysis （TG-DSC） and infrared spectroscopy analysis （FTIR）. The results indicated that the concentration of oxalic acid had a little impact on the morphology of the precursors, which was blocky-shape Ce2（C2O4）3：10H2O with a monoclinic lattice structure. With the volume ratio of organic phase and oxalic acid aqueous solution （aqueous phase） varied from 1：3 to 1：6, the morphologies of the precursors Ce2（C2O4）3· 10H2O precipitates gradually changed from inhomogeneous blocky-shape to uniform spherical particles. The precursors could be turned to CeO2 crystal particles with a fluorite structure by calcining, and the products ceria particles were similar in the size and morphology to the precursors.

关 键 词：MORPHOLOGY stripping method PRECIPITATE rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O614.332[理学—无机化学]