TEM investigation of formation mechanism of monocrystal-thick b-oriented pure silica zeolite MFI film

被引:70
作者
Li, S
Li, ZJ
Bozhilov, KN
Chen, ZW
Yan, YS [1 ]
机构
[1] Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA
[2] Univ Calif Riverside, Cent Facil Adv Microscopy & Microanal, Riverside, CA 92521 USA
关键词
D O I
10.1021/ja0478429
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The first direct transmission electron microscopic (TEM) observation has been carried out on the continuous monocrystal-thick b-oriented pure silica zeolite MFI films produced by in situ crystallization. The self-supporting film samples for TEM study were fabricated by dissolving the steel substrate with acid. This TEM study is free of those artifacts that are typically associated with TEM sample preparations, and allows us to investigate the "true" structure and texture of a very large area of the film and at the same time to focus at will on each individual zeolite crystal in the film. Abundant TEM information including crystallographic orientation relationships among crystals in the film (both out-of-plane and in-plane), grain boundaries, and each crystal grain was obtained. This TEM investigation provides direct unambiguous new evidence to support the homogeneous nucleation mechanism, by which the films form through homogeneous nucleation and crystal growth in the bulk to form equal-sized disk-shape crystals, followed by self-assembly of these crystals onto the substrate to produce a two-dimensional close-packed structure. The last stage of the film formation involves simultaneous space-limited growth and rotation of the individual crystals to realize the in-plane crystallographic control within the film.
引用
收藏
页码:10732 / 10737
页数:6
相关论文
共 27 条
[1]   A highly oriented thin film of zeolite A [J].
Boudreau, LC ;
Tsapatsis, M .
CHEMISTRY OF MATERIALS, 1997, 9 (08) :1705-&
[2]   Zeolite membranes -: state of their development and perspective [J].
Caro, J ;
Noack, M ;
Kölsch, P ;
Schäfer, R .
MICROPOROUS AND MESOPOROUS MATERIALS, 2000, 38 (01) :3-24
[3]   ALIGNED MOLECULAR-SIEVE CRYSTALS [J].
CARO, J ;
FINGER, G ;
KORNATOWSKI, J ;
RICHTERMENDAU, J ;
WERNER, L ;
ZIBROWIUS, B .
ADVANCED MATERIALS, 1992, 4 (04) :273-276
[4]   Corrosion-resistant zeolite coatings by in situ crystallization [J].
Cheng, XL ;
Wang, ZB ;
Yan, YS .
ELECTROCHEMICAL AND SOLID STATE LETTERS, 2001, 4 (05) :B23-B26
[5]   Ordered porous materials for emerging applications [J].
Davis, ME .
NATURE, 2002, 417 (6891) :813-821
[6]   Stability of oriented silicalite-1 films in view of zeolite membrane preparation [J].
denExter, MJ ;
vanBekkum, H ;
Rijn, CJM ;
Kapteijn, F ;
Moulijn, JA ;
Schellevis, H ;
Beenakker, CIN .
ZEOLITES, 1997, 19 (01) :13-20
[7]   VERTICAL ALUMINOPHOSPHATE MOLECULAR-SIEVE CRYSTALS GROWN AT INORGANIC-ORGANIC INTERFACES [J].
FENG, S ;
BEIN, T .
SCIENCE, 1994, 265 (5180) :1839-1841
[8]   GROWTH OF ORIENTED MOLECULAR-SIEVE CRYSTALS ON ORGANOPHOSPHONATE FILMS [J].
FENG, S ;
BEIN, T .
NATURE, 1994, 368 (6474) :834-836
[9]   On the preferred orientation and microstructural manipulation of molecular sieve films prepared by secondary growth [J].
Gouzinis, A ;
Tsapatsis, M .
CHEMISTRY OF MATERIALS, 1998, 10 (09) :2497-2504
[10]  
Ha K, 2001, ADV MATER, V13, P594, DOI 10.1002/1521-4095(200104)13:8<594::AID-ADMA594>3.0.CO