TY - JOUR
T1 - An Extrinsic-Pore-Containing Molecular Sieve Film
T2 - A Robust, High-Throughput Membrane Filter
AU - Hong, Sungwon
AU - Jeong, Yanghwan
AU - Baik, Hionsuck
AU - Choi, Nakwon
AU - Yip, Alex C.K.
AU - Choi, Jungkyu
N1 - Funding Information:
This work was financially supported by the Mid-Career Researcher Program (2020R1A2C1101974), by the Korea CCS R&D Center (KCRC) (2014M1A8A1049309), and by the Super Ultra Low Energy and Emission Vehicle (SULEEV) Center (2016R1A5A1009592) through National Research Foundation (NRF) of Korea. These grants were funded by the Korea government (Ministry of Science and ICT). SK Innovation provided thoughtful insights into the factors related to the p-xylene perm-selectivities of zeolite membranes for real uses in industries. TEM and some SEM characterizations were conducted at KBSI (Seoul Center).
Funding Information:
This work was financially supported by the Mid‐Career Researcher Program (2020R1A2C1101974), by the Korea CCS R&D Center (KCRC) (2014M1A8A1049309), and by the Super Ultra Low Energy and Emission Vehicle (SULEEV) Center (2016R1A5A1009592) through National Research Foundation (NRF) of Korea. These grants were funded by the Korea government (Ministry of Science and ICT). SK Innovation provided thoughtful insights into the factors related to the ‐xylene perm‐selectivities of zeolite membranes for real uses in industries. TEM and some SEM characterizations were conducted at KBSI (Seoul Center). p
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2021/1/18
Y1 - 2021/1/18
N2 - MFI type zeolites with 10-membered-ring pores (ca. 0.55 nm) have the ability to separate p-xylene (ca. 0.58 nm) from its bulkier isomers. Here, we introduced non-zeolitic micropores (ca. 0.6–1.5 nm) and mesopores (ca. 2–7 nm) to a conventional microporous MFI type zeolite membrane, yielding an unprecedented hierarchical membrane structure. The uniform, embedded non-zeolitic pores decreased defect formation considerably and facilitated molecular transport, resulting in high p-xylene perm-selectivity and molar flux. Specifically, compared to a conventional, crack network-containing MFI membranes of similar thickness (ca. 1 μm), the mesoporous MFI membranes showed almost double p-xylene permeance (ca. 1.6±0.4×10−7 mol m−2 s−1 Pa−1) and a high p-/o-xylene separation factor (ca. 53.8±7.3 vs. 3.5±0.5 in the conventional MFI membrane) at 225 °C. The embedded non-zeolitic pores allowed for decreasing the separation performance degradation, which was apparently related to coke formation.
AB - MFI type zeolites with 10-membered-ring pores (ca. 0.55 nm) have the ability to separate p-xylene (ca. 0.58 nm) from its bulkier isomers. Here, we introduced non-zeolitic micropores (ca. 0.6–1.5 nm) and mesopores (ca. 2–7 nm) to a conventional microporous MFI type zeolite membrane, yielding an unprecedented hierarchical membrane structure. The uniform, embedded non-zeolitic pores decreased defect formation considerably and facilitated molecular transport, resulting in high p-xylene perm-selectivity and molar flux. Specifically, compared to a conventional, crack network-containing MFI membranes of similar thickness (ca. 1 μm), the mesoporous MFI membranes showed almost double p-xylene permeance (ca. 1.6±0.4×10−7 mol m−2 s−1 Pa−1) and a high p-/o-xylene separation factor (ca. 53.8±7.3 vs. 3.5±0.5 in the conventional MFI membrane) at 225 °C. The embedded non-zeolitic pores allowed for decreasing the separation performance degradation, which was apparently related to coke formation.
KW - MFI type zeolite membranes
KW - defect-free membranes
KW - hierarchical porous structure
KW - non-zeolitic-pore-containing film
KW - p-/o-xylene separations
UR - http://www.scopus.com/inward/record.url?scp=85097014569&partnerID=8YFLogxK
U2 - 10.1002/anie.202010957
DO - 10.1002/anie.202010957
M3 - Article
C2 - 33026162
AN - SCOPUS:85097014569
SN - 1433-7851
VL - 60
SP - 1323
EP - 1331
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 3
ER -