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Micropore Regulation in Ultrastable [Sc 3 O]-Organic Frameworks for Acetylene Storage and Purification.

Micropore Regulation in Ultrastable [Sc 3 O]-Organic Frameworks for Acetylene Storage and Purification.

Authors :
Lv HJ
Zhang JW
Jiang YC
Li SN
Hu MC
Zhai QG
Source :
Inorganic chemistry [Inorg Chem] 2022 Feb 28; Vol. 61 (8), pp. 3553-3562. Date of Electronic Publication: 2022 Feb 11.
Publication Year :
2022

Abstract

High storage capacity, high separation selectivity, and high structure stability are essential for an idea gas adsorbent. However, it is not easy to achieve all three at the same time, even for the promising metal-organic framework (MOF) adsorbents. We demonstrate herein that robust [Sc <subscript>3</subscript> O]-organic frameworks could be regulated by a micropore combination strategy for high-performance acetylene adsorption. Under the same solvent system with formic acid as a modulator, similar tritopic ligands extend [Sc <subscript>3</subscript> O(COO) <subscript>6</subscript> ] trigonal-prismatic clusters to generate SNNU-5-Sc and SNNU-150-Sc adsorbents. Notably, the two Sc-MOFs can keep their architectures over 24 h in water at different pH values (2-12) or at 90 °C. Modulated by the linker symmetry, the final stacking metal-organic polyhedral cages produce open window sizes of about 10 Å for SNNU-5-Sc and 5 Å + 7 Å for SNNU-150-Sc. Due to such micropore combinations, SNNU-5-Sc exhibits a top-level C <subscript>2</subscript> H <subscript>2</subscript> uptake of 211.2 cm <superscript>3</superscript> g <superscript>-1</superscript> (1 atm and 273 K) and SNNU-150-Sc shows high C <subscript>2</subscript> H <subscript>2</subscript> /CH <subscript>4</subscript> , C <subscript>2</subscript> H <subscript>2</subscript> /C <subscript>2</subscript> H <subscript>4</subscript> , and C <subscript>2</subscript> H <subscript>2</subscript> /CO <subscript>2</subscript> selectivities of 80.65, 4.03, and 8.19, respectively, under ambient conditions. Dynamic breakthrough curves obtained on a fixed-bed column and grand canonical Monte Carlo (GCMC) simulations further support their prominent acetylene storage and purification performance. High framework stability, storage capacity, and separation selectivity make SNNU-5-Sc and SNNU-150-Sc ideal acetylene adsorbents in practical applications.

Details

Language :
English
ISSN :
1520-510X
Volume :
61
Issue :
8
Database :
MEDLINE
Journal :
Inorganic chemistry
Publication Type :
Academic Journal
Accession number :
35148476
Full Text :
https://doi.org/10.1021/acs.inorgchem.1c03562