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Direct Observation of Xe and Kr Adsorption in a Xe-Selective Microporous Metal–Organic Framework

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b02556· OSTI ID:1593339

The cryogenic separation of noble gases is energy-intensive and expensive, especially when low concentrations are involved. Metal organic frameworks containing polarizing groups within their pore spaces are predicted to be efficient Xe/Kr solid state adsorbents but no experimental insights on the nature of the Xe-network interaction is available to date. Here we report a new microporous metal organic framework (designated SBU2) that is selective toward Xe over Kr at ambient conditions, with Xe/Kr selectivity of about 10 and Xe capacity of 37.1 wt% at 298 K. Results of single crystal diffraction show Xe selectivity may be attributed to the specific geometry of the pores, forming cages built with phenyl rings and enriched with polar -OH groups, both serving as strong adsorption sites for polarizable Xe gas. The Xe/Kr separation in SBU2 was investigated with experimental and computational breakthrough methods. These experiments showed that Xe broke through the column after 3 min, followed by Kr at 4.5 min after injection of gases mixture, which confirmed that SBU2 has a real practical potential for separating Xe from Kr. Computational calculations show that SBU2 capacity and adsorption selectivity is comparable to the best-performing unmodified MOFs such as Ni-MOF-74 or Co Formate.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1593339
Report Number(s):
PNNL-SA-111088
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 22 Vol. 137
Country of Publication:
United States
Language:
English

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Reversible Encapsulation of Xenon and CH 2 Cl 2 in a Solid‐State Molecular Organometallic Framework (Guest@SMOM) journal November 2019
Noble gas separation by a MOF with one-dimensional channels journal January 2019
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Employing an Unsaturated Th 4+ Site in a Porous Thorium-Organic Framework for Kr/Xe Uptake and Separation journal April 2018
Metal–organic framework derived nanoporous carbons with highly selective adsorption and separation of xenon journal January 2018
Effect of ring rotation upon gas adsorption in SIFSIX-3-M (M = Fe, Ni) pillared square grid networks journal January 2017
Employing an Unsaturated Th 4+ Site in a Porous Thorium-Organic Framework for Kr/Xe Uptake and Separation journal April 2018
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Reversible Encapsulation of Xenon and CH 2 Cl 2 in a Solid-State Molecular Organometallic Framework (Guest@SMOM) journal October 2019
Structural characterization of framework–gas interactions in the metal–organic framework Co 2 (dobdc) by in situ single-crystal X-ray diffraction journal January 2017
Separation of Xe from Kr with Record Selectivity and Productivity in Anion‐Pillared Ultramicroporous Materials by Inverse Size‐Sieving journal January 2020
Metal–organic framework with optimally selective xenon adsorption and separation journal June 2016
Separation of Xe from Kr with Record Selectivity and Productivity in Anion‐Pillared Ultramicroporous Materials by Inverse Size‐Sieving journal January 2020
Titelbild: Separation of Xe from Kr with Record Selectivity and Productivity in Anion‐Pillared Ultramicroporous Materials by Inverse Size‐Sieving (Angew. Chem. 9/2020) journal January 2020
A microporous metal–organic framework with commensurate adsorption and highly selective separation of xenon journal January 2018
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A nanosized metal–organic framework with small pores for kinetic xenon separation journal January 2018
Tunable Porous Coordination Polymers for the Capture, Recovery and Storage of Inhalation Anesthetics journal May 2017
Cover Picture: Separation of Xe from Kr with Record Selectivity and Productivity in Anion‐Pillared Ultramicroporous Materials by Inverse Size‐Sieving (Angew. Chem. Int. Ed. 9/2020) journal January 2020
Hybrid Ultra-Microporous Materials for Selective Xenon Adsorption and Separation journal May 2016
Iodine capture in porous organic polymers and metal–organic frameworks materials journal January 2019
Porous organic materials with ultra-small pores and sulfonic functionality for xenon capture with exceptional selectivity journal January 2018
Synthesis of novel nanomaterials and their application in efficient removal of radionuclides journal June 2019
A high-performance “sweeper” for toxic cationic herbicides: an anionic metal–organic framework with a tetrapodal cage journal January 2015
An ultrastable Zr-MOF for fast capture and highly luminescence detection of Cr 2 O 7 2− simultaneously in an aqueous phase journal January 2018
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 journal January 2018
Syntheses, Structures, and Luminescence of Metal(II) Coordination Polymers based on Flexible 1,1′-(1,4-Butanediyl)bis(imidazole) and Tetrachlorobenzene-1,4-dicarboxylate Ligands: Syntheses, Structures, and Luminescence of Metal(II) Coordination Polymers based on Flexible 1,1′-(1,4-Butanediyl)bis(imidazole) and Tetrachlorobenzen journal November 2016
General strategies for effective capture and separation of noble gases by metal–organic frameworks journal January 2018
Sensing and capture of toxic and hazardous gases and vapors by metal–organic frameworks journal January 2018
XRD-DSC: a screening tool for identifying effective MOFs for selective gas sorption from humid gas streams journal February 2019


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