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无机材料学报

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镧的引入方法对SO42-改性锆交联粘土固体酸结构的影响

郭锡坤, 谌宁   

  1. 汕头大学化学系, 汕头 515063
  • 收稿日期:2004-01-02 修回日期:2004-04-15 出版日期:2005-01-20 网络出版日期:2005-01-20

Effect of La Introduction Methods on the Structure of SO42-modified Zr-pillared Clay Solid Acid

GUO Xi-Kun, CHEN Ning   

  1. Department of Chemistry, Shantou University, Shantou 515063, China
  • Received:2004-01-02 Revised:2004-04-15 Published:2005-01-20 Online:2005-01-20

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摘要： 以累托土为基质, 采用不同的方法引入La, 制备了四种含La的SO42-改性锆交联粘土固体酸催化剂. 借助N2吸附-脱附, XRD, NH3-TPD, Py-IR等分析手段对催化剂进行表征, 考察了La不同的引入方法对其结构和酸性的影响. 实验结果表明, 先用La交换累托土, 再与Zr交联剂进行交联, 或采用La-Zr双组分交联剂, 采用这两种方法引入La后, 制得的交联粘土的层结构规整性显著提高, 比表面积较大, 孔径较均一, 并且L酸酸量明显增加、酸强度明显增强.

关键词: 交联累托土, 固体酸催化剂, 镧, 结构

Abstract: Four La-containing sulfated Zr-pillared clay solid acids with rectorites as matrix were prepared by utilizing different methods for La introduction and characterized by nitrogen
adsorption/desorption, XRD, NH3-TPD and Py-IR techniques.The effects of different introduction methods for La on the structure and acidity of the
resulting catalysts were investigated. The experimental results show that regularity for the layer structure of formed catalysts is significantly
improved by either exchanging Na-rectorite with LaCl3 solution followed by pillaring with Zr pillaring agent or by utilizing La-Zr bipillaring agent.
In addition, the employment of these two preparation methods leads to a more uniform pore size distribution, a larger specific surface area and an
improvement in the amount and intensity of Lewis acid.

Key words: pillared rectorite, solid acid catalysts, La, structure

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