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In situ crystallization of b-oriented MFI films on plane and curved substrates coated with a mesoporous silica layer

Deng, Zhiyong and Pera-Titus, Marc 2013. In situ crystallization of b-oriented MFI films on plane and curved substrates coated with a mesoporous silica layer. Materials Research Bulletin 48 (5) , pp. 1874-1880. 10.1016/j.materresbull.2013.01.020

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Abstract

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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
ISSN: 0025-5408
Date of Acceptance: 8 January 2013
Last Modified: 11 Jan 2021 15:45
URI: http://orca.cardiff.ac.uk/id/eprint/137416

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