On the formation of vertically oriented MCM-22 zeolite crystal films

被引：13

作者：

Cheng, M ^{[1
]}

Hu, G ^{[1
]}

Tan, D ^{[1
]}

Bao, X ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2001年 / 50卷 / 01期

基金：

中国国家自然科学基金;

关键词：

MCM-22; MWW; zeolite film; zeolite membrane; oriented growth;

D O I：

10.1016/S1387-1811(01)00436-X

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Growth of MCM-22 zeolite films on glass substrates was studied with the focus on the understanding of the unusual vertical crystal orientation. The films formed were characterized by scanning electron microscopy and X-ray diffraction. Separate thin disk-like MCM-22 crystals were found vertically oriented at the early crystallization stage. With crystallization the crystals grew into thick disks and finally into continuous films. The vertically oriented MCM-22 thin crystals could be developed from the orientation of columnar MCM-22 nuclei, which have larger parameters in their c-directions than those in a and b directions. The preferred orientation of MCM-22 nuclei and the fast growth rate in the layer direction are responsible for the vertical growth of MCM-22 zeolite films. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：69 / 76

页数：8

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