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Issue 5, 2018
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One-of-a-kind: a microporous metal–organic framework capable of adsorptive separation of linear, mono- and di-branched alkane isomers via temperature- and adsorbate-dependent molecular sieving

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Abstract

Separation of alkane isomers represents a crucial process in the petrochemical industry in order to achieve a high octane rating of gasoline. Herein, we report the first example of complete separation of linear, monobranched and dibranched alkane isomers using a single adsorbent. A calcium-based robust microporous metal–organic framework, Ca(H2tcpb) (tcpb = 1,2,4,5-tetrakis(4-carboxyphenyl)-benzene), exhibits unique molecular exclusion behavior which enables full separation of binary or ternary mixtures of alkane isomers into the pure form of each isomerate. The successful separation of monobranched and dibranched alkane isomers will not only lead to the production of higher quality gasoline with maximum possible octane numbers but also fill the gap in the current separation technology. Exploration of the separation mechanism indicates that the structural flexibility and adsorbate-dependent structural change of the porous framework play a vital role in the observed temperature-dependent molecular sieving property of the adsorbent.

Graphical abstract: One-of-a-kind: a microporous metal–organic framework capable of adsorptive separation of linear, mono- and di-branched alkane isomers via temperature- and adsorbate-dependent molecular sieving

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Supplementary files

Article information


Submitted
09 Feb 2018
Accepted
29 Mar 2018
First published
29 Mar 2018

Energy Environ. Sci., 2018,11, 1226-1231
Article type
Communication
Author version available

One-of-a-kind: a microporous metal–organic framework capable of adsorptive separation of linear, mono- and di-branched alkane isomers via temperature- and adsorbate-dependent molecular sieving

H. Wang, X. Dong, E. Velasco, D. H. Olson, Y. Han and J. Li, Energy Environ. Sci., 2018, 11, 1226
DOI: 10.1039/C8EE00459E

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