MEL分子筛膜不同取向生长的控制ControlofOrientationinMEL.PDF

2007 年第65 卷 化 学 学 报 Vol. 65, 2007 第21 期, 2494～2498 ACTA CHIMICA SINICA No. 21, 2494～2498 ·研究简报· MEL 分子筛膜不同取向生长的控制 董俊萍a,b 徐引娟a 龙英才*,b (a 上海大学化学系 上海 200444) (b 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) 摘要 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 Control of Orientation in MEL Zeolite Film DONG, Jun-Pinga,b XU, Yin-Juana LONG, Ying-Cai*,b a ( Department of Chemistry, Shanghai University, Shanghai 200444) b ( Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433) Abstract 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 crys- tallites 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 pre- ferred zeolite film with (101) and (200) planes parallel to the support surface. T