Details

Autor(en) / Beteiligte

• Kim, Donghun
• Jeon, Mi Young
• Stottrup, Benjamin L.
• Tsapatsis, Michael

Titel

para‐Xylene Ultra‐selective Zeolite MFI Membranes Fabricated from Nanosheet Monolayers at the Air–Water Interface

Ist Teil von

• Angewandte Chemie (International ed.), 2018-01, Vol.57 (2), p.480-485

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The control of membrane morphology and microstructure is crucial to improve the separation performance of molecular‐sieve membranes. This can be enabled by making thin, dense, and uniform seed‐crystal coatings, which are then intergrown into continuous membranes. Herein, we show a novel and simple floating particle coating method can give closely packed monolayers of zeolite nanosheets on nonporous or porous supports. The zeolite nanosheet monolayer is formed at the air–water interface in a conical Teflon trough. As the water in the trough is drained, the monolayer is deposited on a support placed below. Membranes prepared by gel‐free secondary growth of the nanosheets deposited by this method show unprecedented ultra‐selective performance for separation of para‐ from ortho‐xylene (separation factor >10 000). The membrane drain: A uniform and dense MFI nanosheet monolayer from an air–water interface is transferred onto a porous support by a new monolayer deposition method using a conical trough which drains. The high‐coverage nanosheet seed coating, and subsequent intergrowth gives a thin, oriented, and low‐defect‐density membrane, which exhibits ultra‐selective (separation factor >10 000) performance for xylene isomer separation.