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Issue 1, 2017
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A metal–organic framework functionalized with piperazine exhibiting enhanced CH4 storage

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Abstract

NJU-Bai 19, the first cycloaliphatic ring (piperazine) functionalized MOF-505 analogue, exhibits a notably high methane storage capacity of 246.4 cm3 (STP) cm−3 (at room temperature and 65 bar); this is 93.6% of the new volumetric target of the US Department of Energy if the packing density loss is ignored. Compared with NOTT-101, when piperazine groups are inserted, the methane uptake capacity of NJU-Bai 19 at 65 bar and RT can be significantly enhanced with lower Qst. A relatively low increase was also observed in the uptake at 5 bar. Thus it has a much higher methane storage working capacity (deliverable amount of methane between 65 and 5 bar) of 185 cm3 (STP) cm−3 compared with NOTT-101 (174 cm3 (STP) cm−3). When the temperature was decreased from 298 to 273 K at working pressures between 65 bar and 5 bar, the volumetric CH4 working capacity of NJU-Bai 19 is almost unchanged (from 185 to 189 cm3 (STP) cm−3), while some of the famous MOFs with high Qst showed a decrease with a decrease in temperature. The combination of the balanced porosity and framework density and the lipophilic surface is considered to result in the increased methane storage and working capacities.

Graphical abstract: A metal–organic framework functionalized with piperazine exhibiting enhanced CH4 storage

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Article information


Submitted
18 Jul 2016
Accepted
20 Nov 2016
First published
21 Nov 2016

J. Mater. Chem. A, 2017,5, 349-354
Article type
Paper

A metal–organic framework functionalized with piperazine exhibiting enhanced CH4 storage

M. Zhang, C. Chen, Q. Wang, W. Fu, K. Huang and W. Zhou, J. Mater. Chem. A, 2017, 5, 349
DOI: 10.1039/C6TA06037D

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