高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

多核超顺磁性Ni0.5Zn0.5Fe2O4/SiO2催化载体的制备与表征

王红霞1,2, 张法玲1, 曹媛2, 周波1, 刘志国1, 苏文辉1   

    1. 哈尔滨工业大学应用物理系凝聚态科学与技术研究中心, 哈尔滨 150001;
    2. 哈尔滨师范大学化学系, 哈尔滨 150025
  • 收稿日期:2007-11-01 修回日期:1900-01-01 出版日期:2008-07-10 发布日期:2008-07-10
  • 通讯作者: 苏文辉

Fabrication and Characterization of Multicore Superparamagnetic Ni0.5Zn0.5Fe2O4/SiO2 Catalyst Support

WANG Hong-Xia1,2, ZHANG Fa-Ling1, CAO Yuan2, ZHOU Bo1, LIU Zhi-Guo1, SU Wen-Hui1*   

    1. Center for the Condensed Matter Science and Technology, Department of Applied Physics, Harbin Institute of Technology, Harbin 150001, China;
    2. Department of Chemistry, Harbin Normal University, Harbin 150025, China
  • Received:2007-11-01 Revised:1900-01-01 Online:2008-07-10 Published:2008-07-10
  • Contact: SU Wen-Hui

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摘要： 采用化学共沉淀法与溶胶-凝胶法相结合, 在制备过程中改变磁性纳米粒子和TEOS的引入方式, 成功地制备了多核超顺磁性Ni0.5Zn0.5Fe2O4/SiO2催化剂载体. 采用透射电子显微镜(TEM)、氮气吸附、X射线衍射(XRD)及物理性质综合测试系统(PPMS)对样品进行了表征, 利用永磁铁对载体的分离效果进行了验证. 研究结果表明, 改进制备方法后, 制备的载体比表面积明显增大, 这有利于催化剂在载体上的分散与固载; 样品的饱和磁化强度明显增加, 表明样品具有很好的磁响应能力, 有利于催化剂的分离, 同时, 载体的超顺磁特性也有利于液相催化体系中催化剂的分散.

关键词: 超顺磁性, 多核, 催化剂分离, 饱和磁化强度, 比表面积

Abstract: A multicore superparamagnetic Ni0.5Zn0.5Fe2O4/SiO2 catalyst support was synthesized by slightly modifying the conventional preparation method, namely, altering the manner of introducing Ni0.5Zn0.5Fe2O4 nanoparticles into TEOS. The modified method resulted in a great increase in specific surface area, saturation magnetization of Ni0.5Zn0.5Fe2O4/SiO2 and better separation in liquid system. The synthesized catalyst supports were characterized by means of X-ray diffraction, N2 gas adsorption-desorption experiments, transmission electron microscopy and a physical properties measurement system(PPMS).

Key words: Superparamagneticity, Multicore, Catalyst surport separation, Saturation magnetization, Specific surface area

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