中华医学超声杂志

应用化学 ›› 2009, Vol. 26 ›› Issue (12): 1445-1449.

• 研究论文 • 上一篇    下一篇

膨润土碱熔活化合成4A分子筛的研究

伊莉,马红超*,付颖寰,王永为,于春玲,董晓丽   

  1. (大连工业大学化工与材料学院 大连 116034)
  • 收稿日期:2008-12-08 修回日期:2009-03-11 出版日期:2009-12-10 发布日期:2009-12-10
  • 通讯作者: 马红超,男，博士，教授; E-mail:m-h-c@sohu.com; 研究方向：环保功能材料
  • 基金资助:
    辽宁省科技厅资助项目（05L074, 05L081）

Study on the Synthesis of 4A zeolite from alkali-activated Bentonite

YI Li, MA Hong-Chao*, FU Ying-Huan, WANG Yong-Wei, XU Chun-Ling, DONG Xiao-Li   

  1. (School of Chemical Engineering & Materials,Dalian Polytechnic University,Dalian 116034)
  • Received:2008-12-08 Revised:2009-03-11 Published:2009-12-10 Online:2009-12-10

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摘要：

以天然膨润土为原料，采用高温碱熔水热法合成4A分子筛。探讨了活化温度、SiO2/Al2O3、Na2O/SiO2、H2O/Na2O等工艺条件对4A分子筛结构与性能的影响。结果表明，最佳的活化温度为600℃；物料经此温度活化后，调节组成为SiO2/Al2O3=1.5、Na2O/SiO2=3与H2O/Na2O=50，于90℃反应6小时可以得到质量较好的4A分子筛，其产品的晶形规整，晶粒均小于2μm，钙离子交换容量可达到314mg CaCO3/g。

关键词: 膨润土, 高温碱熔, 4A分子筛

Abstract:

Bentonite reacts with NaOH at high temperature leading to a very reactive starting material for zeolite synthesis. Zeolite 4A has been synthesized by hydrothermal method using these reaction products as raw materials The effect of activation temperature, molar ratio of SiO2/Al2O3,molar ratio of Na2O/SiO2, molar ratio of H2O/Na2O on the properties of the products was investigated by using XRD, SEM and calcium ion exchange capacity. It is found that bentonite reacts with NaOH at 600 ℃ obtained best activated product for zeolite synthesis. The mixed compound as resultant slurry for zeolite 4A having a appropriate composition of : molar ratio of SiO2/Al2O3 =1.5, molar ratio of Na2O/SiO2=3 and molar ratio of H2O/Na2O=50, is then crystallization is carried out at 90℃ for 6 h. Under this optimal condition, zeolite 4A with high degree of crystallinity, small granularity of particles (most of the particle size of zeolite 4A was less than 2 µm) and high calcium ion exchange capacity (314 mg CaCO3/g) was obtained.

Key words: Bentonite,alkaliactivation,zeolite 4A

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