In situ crystallization of b-oriented MFI films on plane and curved substrates coated with a mesoporous silica layer
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AbstractA 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.
CitationDeng Z, Pera-Titus M (2013) In situ crystallization of b-oriented MFI films on plane and curved substrates coated with a mesoporous silica layer. Materials Research Bulletin 48: 1874–1880. Available: http://dx.doi.org/10.1016/j.materresbull.2013.01.020.
SponsorsZ.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.
JournalMaterials Research Bulletin