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采用室温共沉淀、分步沉淀和共沉淀、分步沉淀水热法制备了Ce0.6Zr0.3Pr0.1O2纳米复合氧化物。X射线衍射(XRD)、N2物理吸附、透射电镜(TEM)、H2程序升温还原(H2-TPR)和热重分析技术(TG)表征结果表明:分步沉淀水热法有利于锆离子和镨离子进入CeO2晶格和提高Ce0.6Zr0.3Pr0.1O2纳米复合氧化物的热稳定性、氧化还原性能和储释氧性能。制备过程中未加入任何表面活性剂,1000℃焙烧4 h后,其晶粒尺寸可控制在8~15 nm,比表面积仍能保持在66 m2·g-1,释氧量维持在1713μmol[O]·g-1CeO2。
Ce0.6Zr0.3Pr0.1O2 nanocomposite was prepared by coprecipitation, step-by-step precipitation and coprecipitation at room temperature and by hydrothermal method. X-ray diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), H2 temperature-programmed reduction (H2-TPR) and thermogravimetric analysis (TG) characterization indicated that fractional precipitation hydrothermal method was favorable for zirconium ions and praseodymium Ions into the CeO2 lattice and improve the thermal stability, redox performance and oxygen storage performance of Ce0.6Zr0.3Pr0.1O2 nanocomposite. No surfactant was added in the preparation process, and the grain size could be controlled at 8-15 nm after calcination at 1000 ℃ for 4 h. The specific surface area could still be maintained at 66 m2 · g-1, and the oxygen release was maintained at 1713 μmol [O ] · G-1CeO2.