Twin-free, directly synthesized MFI nanosheets with improved thickness uniformity and their use in membrane fabrication

Donghun Kim, Supriya Ghosh, Nusnin Akter, Andrea Kraetz, Xuekui Duan, Gyeongseok Gwak, Neel Rangnekar, J. R. Johnson, Katabathini Narasimharao, Maqsood Ahmad Malik, Shaeel Al-Thabaiti, Benjamin McCool, J. Anibal Boscoboinik, K. Andre Mkhoyan, Michael Tsapatsis

Research output: Contribution to journalArticlepeer-review

Abstract

Zeolite nanosheets can be used for the fabrication of low-defect-density, thin, and oriented zeolite separation membranes. However, methods for manipulating their morphology are limited, hindering progress toward improved performance. We report the direct synthesis (i.e., without using exfoliation, etching, or other top-down processing) of thin, flat MFI nanosheets and demonstrate their use as high-performance membranes for xylene isomer separations. Our MFI nanosheets were synthesized using nanosheet fragments as seeds instead of the previously used MFI nanoparticles. The obtained MFI nanosheets exhibit improved thickness uniformity and are free of rotational and MEL intergrowths as shown by transmission electron microscopy (TEM) imaging. The nanosheets can form well-packed nanosheet coatings. Upon gel-free secondary growth, the obtained zeolite MFI membranes show high separation performance for xylene isomers at elevated temperature (e.g., p-xylene flux up to 1.5 × 10-3 mol m-2 s-1 and p-/o-xylene separation factor of ∼600 at 250°C).

Original languageEnglish (US)
Article numberabm8162
JournalScience Advances
Volume8
Issue number14
DOIs
StatePublished - Apr 2022

Bibliographical note

Publisher Copyright:
© 2022 The Authors.

PubMed: MeSH publication types

  • Journal Article

Fingerprint

Dive into the research topics of 'Twin-free, directly synthesized MFI nanosheets with improved thickness uniformity and their use in membrane fabrication'. Together they form a unique fingerprint.

Cite this