Preparation of b-Oriented MFI Films on Porous Stainless Steel Substrates

The preparation of smooth mesoporous silica layers on rough, porous stainless steel supports and the subsequent synthesis of well-intergrown b-oriented MFI films on these intermediate layers were investigated. Parameters such as surfactant−silica sol dilution, number of coating cycles, drying, and c...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2005-11, Vol.44 (24), p.9086-9095
Main Authors: Mabande, Godwin T. P, Ghosh, Shubhajit, Lai, Zhiping, Schwieger, Wilhelm, Tsapatsis, Michael
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
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Summary:The preparation of smooth mesoporous silica layers on rough, porous stainless steel supports and the subsequent synthesis of well-intergrown b-oriented MFI films on these intermediate layers were investigated. Parameters such as surfactant−silica sol dilution, number of coating cycles, drying, and calcination were systematically varied to optimize mesoporous silica deposition results. Multiple slip- and aerosol-coating cycles with intermediate drying/calcination steps had to be employed to prepare mesoporous layers with adequate thickness and minimal cracking. b-Oriented MFI seed monolayers could be covalently attached to these mesoporous layers with high coverage using 3-chloropropyltrimethoxysilane as the coupling agent. Sonication during the final step of seed deposition was found to be necessary to achieve high seed coverage and orientation. Finally, highly b-oriented and intergrown MFI films could be produced by secondary growth of b-oriented seed layers using trimer tetrapropylammonium iodide as the structure-directing agent.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie050668s