Pore environment engineering in metal-organic frameworks for efficient ethane/ethylene separation

Selective adsorption of trace amounts of C 2 H 6 from bulk C 2 H 4 is a significantly important and extremely challenging task in industry, which requires an adsorbent with specific pore properties. Herein, we describe a strategy for adjusting the pore environment of metal-organic frameworks (MOFs)...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (22), p.13585-1359
Main Authors: Wang, Xun, Niu, Zheng, Al-Enizi, Abdullah M, Nafady, Ayman, Wu, Yufang, Aguila, Briana, Verma, Gaurav, Wojtas, Lukasz, Chen, Yu-Sheng, Li, Zhong, Ma, Shengqian
Format: Article
Language:English
Subjects:
Adsorption
Crystallography
Ethane
Ligands
Metal-organic frameworks
Metals
NMR
Nuclear magnetic resonance
Recyclability
Selective adsorption
Selectivity
Separation
Single crystals
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Selective adsorption of trace amounts of C 2 H 6 from bulk C 2 H 4 is a significantly important and extremely challenging task in industry, which requires an adsorbent with specific pore properties. Herein, we describe a strategy for adjusting the pore environment of metal-organic frameworks (MOFs) by introducing different amounts of methyl groups in the channel to enhance the guest-host interaction between C 2 H 6 and the framework. To prove this concept, 2,3,5,6-tetramethylterephthalic acid (TMBDC) was deliberately added to a microporous MOF, Ni(BDC)(DABCO) 0.5 , affording a series of mixed-ligand materials, Ni(BDC) 1− x (TMBDC) x (DABCO) 0.5 ( x = 0, 0.2, 0.45, 0.71, 1), having different pore environments. Significantly, these mixed-ligand materials demonstrated improved performance in terms of the adsorption capacity of C 2 H 6 and C 2 H 4 with an unprecedented C 2 H 6 uptake of 2.21 mmol g −1 for Ni(TMBDC)(DABCO) 0.5 at 0.0625 bar and 298 K. With the best theoretical C 2 H 6 /C 2 H 4 selectivity predicted by IAST, Ni(TMBDC)(DABCO) 0.5 exhibited effective separation of C 2 H 6 /C 2 H 4 (1/15, v/v) and great recyclability in five consecutive adsorption/desorption cycles throughout the breakthrough experiment. Methyl groups are introduced on the pore walls of a metal-organic framework to enhance the separation performance of C 2 H 6 /C 2 H 4 .
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta02822f