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›› 2005, Vol. 5 ›› Issue (4): 394-398.

• 反应与分离 • 上一篇    下一篇

合成方法对b沸石结构、酸性和催化性能的影响

马 骏,王海彦,田彦文   

  1. 东北大学材料与冶金学院
  • 出版日期:2005-08-20 发布日期:2005-08-20

Effect of Synthesis Method on Structure, Acidity and Catalytic Ability of Zeolite Beta

MA Jun,WANG Hai-yan,TIAN Yan-wen   

  1. Department of material and metallurgy, Northeastern University
  • Online:2005-08-20 Published:2005-08-20

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摘要： 以粗孔硅胶为硅源，偏铝酸钠为铝源，四乙基氢氧化铵为模板剂，分别采用微波辐射法和水热法合成了b沸石. 采用IR，NH3-TPD和XRD对b沸石样品进行表征，研究了不同制备条件对b沸石样品的相对结晶度和表面酸性质的影响. 在固定床反应装置上考察了b沸石样品催化裂化轻汽油的醚化活性. 结果表明，与传统方法相比，微波辐射法合成b沸石，模板剂用量减少25%，晶化时间缩短36 h，脱模时间缩短3.5 h. 微波合成样品经微波辐射脱除模板剂所得b沸石总酸量高，B酸分布好，醚化反应活性高.

关键词: β沸石, 合成, 微波辐射, 水热法, 醚化

Abstract: b-zeolite was synthesized by using tetraethylammonium hydroxide (TEAOH) as organic template, silicon gel as silicon source and sodium meta-aluminate as aluminum source, and adopting microwave radiation and hydrothermal method. The b-zeolite samples were characterized by IR, NH3-TPD and XRD. The effects of the different preparation conditions on relative crystallinity and surface acidity of b-zeolite were studied. The etherification test for fluidized catalytic cracking light gasoline was carried out in a fixed-bed reactor. The results showed that the amount of organic template in microwave radiation method was less 25%, crystallizing time shorter 36 h, and removing template time shorter 3.5 h than those in the conventional method of calcination. The b-zeolite with microwave radiation in synthesis and removing template had a higher total acid amount and an ideal distribution of Bronsted acid, and the optimum etherification activity.

Key words: β-zeolite, synthesization, microwave radiation, hydrothermal method, etherification