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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (21): 2494-2498. 上一篇    下一篇

研究简报

MEL分子筛膜不同取向生长的控制

董俊萍1,2，徐引娟1，龙英才*,2   

  1. (1上海大学化学系 上海 200444)
    (2复旦大学化学系 上海市分子催化与创新材料重点实验室 上海 200433)
  • 投稿日期:2007-03-21 修回日期:2007-06-08 发布日期:2007-11-14
  • 通讯作者: 龙英才

Control of Orientation in MEL Zeolite Film

DONG Jun-Ping1,2; XU Yin-Juan1; LONG Ying-Cai*,2   

  1. (1 Department of Chemistry, Shanghai University, Shanghai 200444)
    (2 Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433)
  • Received:2007-03-21 Revised:2007-06-08 Published:2007-11-14
  • Contact: LONG Ying-Cai

PDF

879

被引次数

7

采用晶种涂层的方法在单晶硅表面上制备了不同取向的MEL分子筛膜, 详细研究了膜的择优生长条件及其取向控制. 水含量和反应时间对膜的取向有较大影响. 在水含量较低的反应体系中, 缩短反应时间有利于得到(101)取向的分子筛膜. 水含量提高导致膜的取向发生变化, 由(101)取向变为(101)/(200)混合取向. 晶种层对膜的取向没有直接影响, 晶种层连续生长形成单层分子筛膜.

关键词: MEL, 分子筛膜, 择优生长, 晶种涂层

MEL zeolite films with various orientations were prepared on the surface of single crystal silicon by a seeding method, and the influences of the synthesis conditions upon the orientation for the zeolite crystallites in the films were investigated. It suggests that the crystal orientation strongly depends on the water content in the reactants and the crystallization periods. The concentrated reactant in a shorter crystallization time forms favorably the zeolite film with (101) orientation, whereas the dilute reactant crystallizes the preferred zeolite film with (101) and (200) planes parallel to the support surface. The seed layer has no direct influence on the orientation of the zeolite film. The continuing growth of the seed layer forms a mono-layer zeolite film.

Key words: MEL, zeolite film, preferred growth, seed layer