共沸蒸馏法合成CeO2纳米颗粒研究

Synthesis of CeO2 Nanoparticles by Azeotropic Distillation Processing

分别以乙醇、正丙醇、异丙醇、正丁醇、异丁醇、仲丁醇及叔丁醇等七种有机醇作为共沸剂，采用液相沉淀法结合共沸蒸馏处理前驱体成功合成了分散性良好、粒子尺寸分布为10-20nm的纳米CeO2颗粒，运用TG／DTA、FI—IR、XRD、TEM等方法对不同有机醇的共沸蒸馏作用以及产品性能进行了分析和表征，探讨了共沸蒸馏法制备纳米CeO2的机理。结果表明：共沸蒸馏能起到有效脱除前驱体凝胶中的水分，防止其干燥和焙烧过程中的硬团聚形成的作用，其中七种醇中以正丁醇的共沸蒸馏效果最佳，所得纳米CeO2颗粒的粒度、均匀及分散性能最好。

CeO2 nanoparticles were synthesized by precipitation method. The azeotropic distillation technique was carried out to dehydrate hydrous gels and ensure complete elimination of the residual water in the precursors. The effects of seven different alcohols （ethanol, n-propyl alcohol, isopropanol, n-butyl alcohol, isobutanol, secondary butyl alcohol, tert-butyl alcohol） as entrainer were compared with each other. DSC （different scanning calorimetry）/TG （thermalgravimetric）, FI-IR （Infra-red spectrum analysis）, XRD （X-ray diffraction） and TEM （transmission electron spectroscopy） were performed to characterize the structures and properties of CeO2 nanoparticles. Among seven alcahols, n-butyl alcohol has the best effect during azeotropic distillation. After azeotropic distillation with n-butyl alcohol, particles with well dispersity and an average size of 10-20nm were obtained. The azeotropie distillation processing was proved to be quite effective in reduced the possibility of the formation of chemical bonds and prevented the formation of hard agglomerates.