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Continuous Zeolite MFI Membranes Fabricated from 2D MFI Nanosheets on Ceramic Hollow Fibers.

08:00 EDT 9th April 2019 | BioPortfolio

Summary of "Continuous Zeolite MFI Membranes Fabricated from 2D MFI Nanosheets on Ceramic Hollow Fibers."

This work addresses the challenge of low-cost fabrication of zeolite membranes on hollow fiber substrates starting from 2-dimensional (2D) zeolite nanosheets. High-quality 2D MFI nanosheet coatings are first prepared on α-alumina hollow fiber supports by a simple vacuum filtration method. The 2D-MFI coating is then transformed into a molecular sieving membrane by a sequence of two hydrothermal treatments: the first involving a tetrapropylammonium fluoride (TPAF) structure-directing agent, and the second involving a tetraethylammonium hydroxide (TEAOH) structure directing agent. This processing methodology carried out using very-low-cost macroporous alumina hollow fibers, eliminates the need for specially engineered silica-based support materials that have so far been necessary to allow the formation of functional membranes from 2D MFI nanosheets. The sequential hydrothermal treatment steps are seen to enhance adhesion of the membrane on the fiber support, fill in nanoscale gaps between the 2D nanosheets, as well as preserve the desirable (0k0) out-of-plane orientation, without need of any support engineering or modification. This microstructurally optimized 2D MFI-based hollow fiber membrane exhibits high performance for separation of n-butane from i-butane, and for other technologically important hydrocarbon separations. The present findings have strong implications on strategies for obtaining thin, highly selective zeolite membranes from 2D zeolites in a technologically scalable manner.

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This article was published in the following journal.

Name: Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
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