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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (11): 1271-1275. 上一篇    

研究简报

一种合成六方板状Zr-Ce-SBA-15介孔材料的新方法

袁金芳a,b 李健生a 顾 娟a 夏敏亚a 孙秀云a
韩卫清a 王连军*,a

  

  1. (a南京理工大学环境科学与工程系 南京 210094)
    (b河南大学精细化学与工程研究所 开封 475001)

  • 投稿日期:2008-10-31 修回日期:2008-12-25 发布日期:2009-06-14
  • 通讯作者: 王连军

A Novel Method for Synthesis of Zr-Ce-SBA-15 Mesoporous Materials with Hexagonal-platelet Morphology

Yuan, Jinfang a,b Li, Jiansheng a Gu, Juan a Xia, Minya a Sun, Xiuyun a
Han, Weiqing a Wang, Lianjun *,a

  

  1. (a Department of Environmental Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094)
    (b Institute of Fine Chemicals and Engineering, Henan University, Kaifeng 475001)

  • Received:2008-10-31 Revised:2008-12-25 Published:2009-06-14
  • Contact: Wang, Lianjun

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被引次数

39 | 9

以P123为模板剂, 正硅酸乙酯为硅源, 氯化氧锆和硝酸亚铈为无机前驱盐, 在不外加无机酸的条件下, 利用无机前驱盐自身水解产生的弱酸性环境, 通过水热合成路线一步合成了具有大的径轴比、短孔道、六方板状形貌的Zr-Ce-SBA-15介孔材料. 利用粉末X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、电感耦合等离子体原子发射光谱(ICP-AES)和氮气吸附等手段对所合成的样品进行了表征. 结果表明, 合成的材料具有类似于SBA-15的二维六方介孔结构, 孔径、孔容和比表面积分别为5.6 nm, 0.96 cm3/g和776 m2/g. 与常规SBA-15相比, 这种短孔道、大径轴比的六方板状介孔材料在吸附、分离及催化等领域中能更有效地促进分子的扩散传递.

关键词: Zr-Ce-SBA-15, 六方板状形貌, 制备, 介孔材料

Highly ordered mesoporous Zr-Ce-SBA-15 silica with hexagonal-platelet morphology was synthesized through a hydrothermal route by using pluronic P123 as a template, tetraethyl orthosilicate as a silica source, zirconyl chloride and cerous nitrate as a precursor. The main strategy of this method was to utilize the acidity self-generated from the hydrolysis of inorganic salts in the aqueous solutions, where no addition of mineral acids was necessary. The as-synthesized materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), inductively coupled plasma atomic emission spectrometry (ICP-AES) and N2 adsorption. Characterization reveals that the Zr-Ce-SBA-15 possesses a 2D hexagonal mesoporous structure similar to SBA-15. The average pore size, pore volume and specific surface area of the materials is 5.58 nm, 0.96 cm3/g and 776 m2/g, respectively. The hexagonal-platelet Zr-Ce-SBA-15 materials were superior to the conventional SBA-15 of rod or fiber morphology in facilitating molecular diffusion when they were used in the adsorption, separation and catalysis processes.

Key words: Zr-Ce-SBA-15, hexagonal-platelet morphology, synthesis, mesoporous material