高等学校化学学报

高等学校化学学报

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贯通孔道网络结构大孔Al2O3催化材料的制备

王晓冬, 仪桂云, 刘豫   

  1. 河南理工大学材料科学与工程学院, 焦作 454003
  • 收稿日期:2008-04-23 修回日期:1900-01-01 出版日期:2009-02-10 发布日期:2009-02-10
  • 通讯作者: 王晓冬

Preparation of Al2O3 Catalytic Material with Run-through-macropore Network Structure

WANG Xiao-Dong*, YI Gui-Yun, LIU Yu   

  1. Institute of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
  • Received:2008-04-23 Revised:1900-01-01 Online:2009-02-10 Published:2009-02-10
  • Contact: WANG Xiao-Dong

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摘要： 采用模板法制备了具有贯通孔道网络结构的大孔Al2O3催化材料. 为确保模板材料的体积分数低于74%时Al2O3孔道的贯通, 设计并实现了模板聚苯乙烯(PS)微球先胶凝再与催化材料Al2O3纳米颗粒复合的制备路线. 通过PS微球悬浮液的流变性表征凝胶状态的形成. 实验结果表明, 加入适当浓度的硝酸铝溶液后PS微球悬浮液出现了由溶胶向凝胶的转变. 通过扫描电镜对大孔Al2O3催化材料的孔道结构进行表征, 结果表明, 与有序大孔材料相比大孔催化材料中孔配位数有所降低, 骨架厚度提高且具有贯通的孔道网络结构. 大孔结构抗压强度实验表明, 随着模板PS微球质量分数的降低, 机械强度明显提高.

关键词: 大孔催化材料, 聚苯乙烯微球, 纳米Al2O3颗粒, 凝胶

Abstract: A new way to prepare Al2O3 catalytic material by template method was reported. This material has good mechanical strength and run-through-macropore network structure to carry catalysts. In order to guarantee the run-through of the macropores when the volume fraction of template polystyrene(PS) was below 74%, the modified polystyrene(PS) microspheres in suspension were gelled before they were compounded with the nanoparticles of Al2O3. Rheological test was used to characterize the gelating process of PS microspheres suspension. It was indicated that adding Al(NO3)3 solution with suitable concentration helps the transformation of suspension from sol to gel. Scanning electron microscopic(SEM) images show that the coordination number of macroporous Al2O3 material is lower than that of ordered macroporous structures and its framework is thicker. Additionally, the macropores left by the templates are interconnective through some windows. Compressive strength test on this material proved that its mechanical strength was improved remarkably as the mass fraction of template PS microspheres decreased.

Key words: Macroporous catalytic material, Polystyrene sphere, Al2O3 nanoparticle, Gel

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