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Orthogonal-array dynamic molecular sieving of propylene/propane mixtures
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Journal Article
Orthogonal-array dynamic molecular sieving of propylene/propane mixtures
2021
Overview
Rigid molecular sieving materials work well for small molecules with the complete exclusion of large ones
1
–
3
, and molecules with matching physiochemical properties may be separated using dynamic molecular sieving materials
4
–
6
. Metal–organic frameworks (MOFs)
7
–
9
are known for their precise control of structures and functions on a molecular level
10
–
15
. However, the rational design of local flexibility in the MOF framework for dynamic molecular sieving remains difficult and challenging. Here we report a MOF material (JNU-3a) featuring one-dimension channels with embedded molecular pockets opening to propylene (C
3
H
6
) and propane (C
3
H
8
) at substantially different pressures. The dynamic nature of the pockets is revealed by single-crystal-to-single-crystal transformation upon exposure of JNU-3a to an atmosphere of C
3
H
6
or C
3
H
8
. Breakthrough experiments demonstrate that JNU-3a can realize high-purity C
3
H
6
(≥99.5%) in a single adsorption–desorption cycle from an equimolar C
3
H
6
/C
3
H
8
mixture over a broad range of flow rates, with a maximum C
3
H
6
productivity of 53.5 litres per kilogram. The underlying separation mechanism—orthogonal-array dynamic molecular sieving—enables both large separation capacity and fast adsorption–desorption kinetics. This work presents a next-generation sieving material design that has potential for applications in adsorptive separation.
A dynamic molecular sieve made from a metal–organic framework with orthogonally arrayed pockets is capable of separating propylene (C
3
H
6
) from a propylene (C
3
H
6
)/propane (C
3
H
8
) gas mixture.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
