TY - JOUR
T1 - Twin-free, directly synthesized MFI nanosheets with improved thickness uniformity and their use in membrane fabrication
AU - Kim, Donghun
AU - Ghosh, Supriya
AU - Akter, Nusnin
AU - Kraetz, Andrea
AU - Duan, Xuekui
AU - Gwak, Gyeongseok
AU - Rangnekar, Neel
AU - Johnson, J. R.
AU - Narasimharao, Katabathini
AU - Malik, Maqsood Ahmad
AU - Al-Thabaiti, Shaeel
AU - McCool, Benjamin
AU - Boscoboinik, J. Anibal
AU - Mkhoyan, K. Andre
AU - Tsapatsis, Michael
N1 - Publisher Copyright:
© 2022 The Authors.
PY - 2022/4
Y1 - 2022/4
N2 - 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).
AB - 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).
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U2 - 10.1126/sciadv.abm8162
DO - 10.1126/sciadv.abm8162
M3 - Article
C2 - 35385314
AN - SCOPUS:85127673901
SN - 2375-2548
VL - 8
JO - Science Advances
JF - Science Advances
IS - 14
M1 - abm8162
ER -