高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (12): 1971.

• 研究论文 • 上一篇    下一篇

预涂布晶种法合成无缺陷A型分子筛膜的研究

林海强1, 杨乐夫1, 万惠霖1, 刘云凌2, 庞文琴2   

  1. 1. 固体表面物理化学国家重点实验室, 厦门大学物理化学研究所, 厦门 361005;
    2. 吉林大学无机合成与制备化学国家重点实验室, 长春 130023
  • 收稿日期:2000-12-06 出版日期:2001-12-24 发布日期:2001-12-24
  • 通讯作者: 林海强(1972年出生),男,博士,讲师,主要从事无机膜和纳米功能材料的研究.

Dense A-type Zeolite Membrane Synthesized by Seeding

LIN HaiQiang1, YANG LeFu1, WAN HuiLin1   

  1. 1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Institute for Physical Chemistry, Xiamen University, Xiamen 361005, China;
    2. State Key Laboratory of Inorganic Synthesis and Prep arative Chemistry, Jilin University, Chang chun 130023, China
  • Received:2000-12-06 Online:2001-12-24 Published:2001-12-24

PDF (PC)

被引次数

37

摘要： 采用一种颗粒度约为200nm的胶态A型分子筛为晶种源,对晶种层进行特殊的蒸气处理后,进一步采取原位水热晶化法,在多孔氧化铝载体表面制备出A型分子筛膜.膜分子筛以特殊的孪生聚晶形式生长在一起,可有效地消除晶粒间隙,形成致密的分子筛膜层.晶化反应液的碱度对A型分子筛膜的质量影响很大,低碱度更有利于A型分子筛膜的生长.在对分子筛膜进行高温活化处理过程中产生一些缺陷孔,降低了膜气体分离性能.

关键词: 分子筛膜, 膜分离, A型分子筛, 无机膜

Abstract: The synthesis of Atype zeolite membranes on porous α Al2O3 supports via the method of seeding plus secondary hydrothermal crystallization has been studied. The seed layers, which were prepared from colloidal Atype zeolite synthesized from the reaction mixture of n[(TMA)2O]: n (SiO2): n (Al2O3): n (Na2O): n (H2O)=13.4:11.25:1.8:0.3:700, were treated by steam of ammonia to inhibit the formation of cracks when dried. Compact zeolite membranes constituted with multipletwined zeolite crystals were accessed by hydrothermal growth of seed layers in the reaction sol of n (Na2O): n (Al2O3): n (SiO2): n (H2O)=3:1:1:800. In highly alkaline hydrothermal solutions, seed layers tended to dissolve and loose zeolite membranes with many defects were obtained. The gas permeanbility on Atype zeolite membrane dried at 393 K, in which water molecular still inhabited the zeolitic channels, was quite low, suggesting that the membrane was close to free of defects. Defects were formed mainly due to different thermal expansion coefficients between α Al2O3 support and zeolite membrane when the calcinations at 823 Kwas carried out to free the channel of membrane zeolites.

Key words: Zeolite membrane, Membrane separation, Atype zeolite, Inorganic membrane

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