Abstract
Adsorbents executing molecular sieving mechanisms for the efficient separation of n-hexane (C6) alkane isomers require delicate pore size control, but afford unsatisfactory single-component separations according to their branch degrees. Herein, we report a novel oxygenate-pillared microporous adsorbent, MoOFOUR-Co-tpb, ([Co(tpb)2MoO4], tpb = 1,2,4,5-tetra(pyridin-4-yl) benzene), with three gourd-shaped channels for dual pore-size sieving of C6 isomers. In particular, MoOFOUR-Co-tpb excludes 2,2-dimethylbutane, while 3-methylpentane (3MP) can enter one channel showing a high uptake of 82.6 mg g−1, contrasting to the n-hexane (nHEX) adsorption by two channels (136 mg g−1). This dual pore-size control strategy renders a record high equilibrium–kinetic combined selectivity for nHEX/3MP (30.2). Moreover, three- and five-component breakthrough experiments confirm the practical separation performances and cycling stability. Multiple theoretical simulations reveal the separation mechanism and adsorption sites.
Original language | English (US) |
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Article number | e17937 |
Journal | AIChE Journal |
Volume | 69 |
Issue number | 3 |
DOIs | |
State | Published - Mar 2023 |
Keywords
- C6 alkanes
- adsorptive separation
- equilibrium–kinetic effect
- metal–organic framework
- molecular sieving
ASJC Scopus subject areas
- Biotechnology
- Environmental Engineering
- General Chemical Engineering
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CCDC 2072716: Experimental Crystal Structure Determination
Su, Y. (Contributor), Chen, R. (Contributor), Zhang, P. (Contributor), He, X. (Contributor), Liu, X. (Contributor), Liu, Y. (Contributor), Xiong, H. (Contributor), Zhao, Z. (Contributor), Luo, J. (Contributor), Chen, J. (Contributor), Chen, S. (Contributor), Zeng, Z. (Contributor), Bao, Z. (Contributor), Deng, S. (Contributor) & Wang, J. (Contributor), Cambridge Crystallographic Data Centre, 2024
DOI: 10.5517/ccdc.csd.cc27kttg, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccdc.csd.cc27kttg&sid=DataCite
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