A simple and reproducible method is presented for preparing b-oriented MFI films on plane (disc) and curved (hollow fiber) supports by in situ hydrothermal synthesis. A mesoporous silica (sub-)layer was pre-coated on the supports by dip coating followed by a rapid thermal calcination step (973 K during 1 min) to reduce the number of grain boundaries while keeping the hydrophilic behavior of silica. The role of the silica sub-layer is not only to smoothen the substrate surface, but also to provide a silica source to promote the nucleation and growth of zeolite crystals via a heterogeneous nucleation mechanism (zeolitization), and adsorb zeolite moieties generated in the synthesis solution via a homogeneous nucleation mechanism. A monolayer of b-oriented MFI crystals was obtained on both supports after 3 h synthesis time with a moderate degree of twinning on the surface. © 2013 Elsevier Ltd.
|Original language||English (US)|
|Number of pages||7|
|Journal||Materials Research Bulletin|
|State||Published - May 2013|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Z.D. would like to acknowledge Dr. Bo Wang from KAUST for providing the YSZ hollow fibers and for the helpful comments in the preparation of this manuscript.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.