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Tian Z, Jiang P, Xu R. NMR Relaxation of Gas Adsorbed in Microporous Material. J Phys Chem Lett 2024; 15:3023-3028. [PMID: 38465889 DOI: 10.1021/acs.jpclett.4c00221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
NMR relaxometry has been widely applied to characterize fluid confined in porous media because of its versatility, chemical selectivity, and noninvasive nature. Here we extend its usage to gas adsorbed in microporous materials by establishing a new quantitative model based on the molecular level NMR relaxation mechanism revealed by the molecular simulation of a prototypical adsorption system, CH4 adsorbed in ZIF-8. The model enables new NMR relaxometry-based characterization methods for thermodynamic, dynamic, and structural properties of adsorption systems, as demonstrated and validated by the experiments where the adsorption capacity and self-diffusivity of H2, CH4, and small alcohols adsorbed in ZIF-8 are deduced from the NMR relaxation data. The findings can serve for a better understanding of the composition-structure-properties relationships of a wide range of adsorption systems which is essential for the development and application of new functional microporous materials.
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Affiliation(s)
- Zijian Tian
- Key Laboratory for CO2 Utilization and Reduction Technology of Beijing, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
| | - Peixue Jiang
- Key Laboratory for CO2 Utilization and Reduction Technology of Beijing, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
| | - Ruina Xu
- Key Laboratory for CO2 Utilization and Reduction Technology of Beijing, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
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2
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Vieira R, Marin-Montesinos I, Pereira J, Fonseca R, Ilkaeva M, Sardo M, Mafra L. "Hidden" CO 2 in Amine-Modified Porous Silicas Enables Full Quantitative NMR Identification of Physi- and Chemisorbed CO 2 Species. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:14797-14806. [PMID: 34567337 PMCID: PMC8456409 DOI: 10.1021/acs.jpcc.1c02871] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 06/17/2021] [Indexed: 06/13/2023]
Abstract
Although spectroscopic investigation of surface chemisorbed CO2 species has been the focus of most studies, identifying different domains of weakly interacting (physisorbed) CO2 molecules in confined spaces is less trivial as they are often indistinguishable resorting to (isotropic) NMR chemical shift or vibrational band analyses. Herein, we undertake for the first time a thorough solid-state NMR analysis of CO2 species physisorbed prior to and after amine-functionalization of silica surfaces; combining 13C NMR chemical shift anisotropy (CSA) and longitudinal relaxation times (T 1). These methods were used to quantitatively distinguish otherwise overlapping physisorbed CO2 signals, which contributed to an empirical model of CO2 speciation for the physi- and chemisorbed fractions. The quantitatively measured T 1 values confirm the presence of CO2 molecular dynamics on the microsecond, millisecond, and second time scales, strongly supporting the existence of up to three physisorbed CO2 species with proportions of about 15%, 15%, and 70%, respectively. Our approach takes advantage from using adsorbed 13C-labeled CO2 as probe molecules and quantitative cross-polarization magic-angle spinning to study both physi- and chemisorbed CO2 species, showing that 45% of chemisorbed CO2 versus 55% of physisorbed CO2 is formed from the overall confined CO2 in amine-modified hybrid silicas. A total of six distinct CO2 environments were identified from which three physisorbed CO2 were discriminated, coined here as "gas, liquid, and solid-like" CO2 species. The complex nature of physisorbed CO2 in the presence and absence of chemisorbed CO2 species is revealed, shedding light on what fractions of weakly interacting CO2 are affected upon pore functionalization. This work extends the current knowledge on CO2 sorption mechanisms providing new clues toward CO2 sorbent optimization.
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Affiliation(s)
| | | | - João Pereira
- CICECO − Aveiro Institute
of Materials, Department of Chemistry, University
of Aveiro, Campus Universitário
de Santiago, 3810-193 Aveiro, Portugal
| | - Rita Fonseca
- CICECO − Aveiro Institute
of Materials, Department of Chemistry, University
of Aveiro, Campus Universitário
de Santiago, 3810-193 Aveiro, Portugal
| | - Marina Ilkaeva
- CICECO − Aveiro Institute
of Materials, Department of Chemistry, University
of Aveiro, Campus Universitário
de Santiago, 3810-193 Aveiro, Portugal
| | - Mariana Sardo
- CICECO − Aveiro Institute
of Materials, Department of Chemistry, University
of Aveiro, Campus Universitário
de Santiago, 3810-193 Aveiro, Portugal
| | - Luís Mafra
- CICECO − Aveiro Institute
of Materials, Department of Chemistry, University
of Aveiro, Campus Universitário
de Santiago, 3810-193 Aveiro, Portugal
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3
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Roztocki K, Rauche M, Bon V, Kaskel S, Brunner E, Matoga D. Combining In Situ Techniques (XRD, IR, and 13C NMR) and Gas Adsorption Measurements Reveals CO 2-Induced Structural Transitions and High CO 2/CH 4 Selectivity for a Flexible Metal-Organic Framework JUK-8. ACS APPLIED MATERIALS & INTERFACES 2021; 13:28503-28513. [PMID: 34101414 PMCID: PMC8289234 DOI: 10.1021/acsami.1c07268] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Flexible metal-organic frameworks (MOFs) are promising materials in gas-related technologies. Adjusting the material to processes requires understanding of the flexibility mechanism and its influence on the adsorption properties. Herein, we present the mechanistic understanding of CO2-induced pore-opening transitions of the water-stable MOF JUK-8 ([Zn(oba)(pip)]n, oba2- = 4,4'-oxybis(benzenedicarboxylate), pip = 4-pyridyl-functionalized benzene-1,3-dicarbohydrazide) as well as its potential applicability in gas purification. Detailed insights into the global structural transformation and subtle local MOF-adsorbate interactions are obtained by three in situ techniques (XRD, IR, and 13CO2-NMR). These results are further supported by single-crystal X-ray diffraction (SC-XRD) analysis of the solvated and guest-free phases. High selectivity toward carbon dioxide derived from the single-gas adsorption experiments of CO2 (195 and 298 K), Ar (84 K), O2 (90 K), N2 (77 K), and CH4 (298 K) is confirmed by high-pressure coadsorption experiments of the CO2/CH4 (75:25 v/v) mixture at different temperatures (288, 293, and 298 K) and in situ NMR studies of the coadsorption of 13CO2/13CH4 (50:50 v/v; 195 K).
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Affiliation(s)
- Kornel Roztocki
- Faculty
of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego
8, 61-614 Poznań, Poland
- Center
for Advanced Technologies, Adam Mickiewicz
University, Uniwersytetu
Poznańskiego 10, 61-614 Poznań, Poland
| | - Marcus Rauche
- Chair
of Bioanalytical Chemistry, Technische Universität
Dresden, Bergstrasse 66, 01062 Dresden, Germany
| | - Volodymyr Bon
- Chair
of Inorganic Chemistry, Technische Universität
Dresden, Bergstrasse
66, 01062 Dresden, Germany
| | - Stefan Kaskel
- Chair
of Inorganic Chemistry, Technische Universität
Dresden, Bergstrasse
66, 01062 Dresden, Germany
| | - Eike Brunner
- Chair
of Bioanalytical Chemistry, Technische Universität
Dresden, Bergstrasse 66, 01062 Dresden, Germany
| | - Dariusz Matoga
- Faculty
of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
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4
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Fu Y, Guan H, Yin J, Kong X. Probing molecular motions in metal-organic frameworks with solid-state NMR. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213563] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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5
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Sin M, Kavoosi N, Rauche M, Pallmann J, Paasch S, Senkovska I, Kaskel S, Brunner E. In Situ 13C NMR Spectroscopy Study of CO 2/CH 4 Mixture Adsorption by Metal-Organic Frameworks: Does Flexibility Influence Selectivity? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3162-3170. [PMID: 30695636 DOI: 10.1021/acs.langmuir.8b03554] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Metal-organic frameworks are promising candidates for selective separation processes such as CO2 removal from methane (natural gas sweetening). Framework flexibility, that is, the ability of a MOF lattice to change its structure as a function of parameters like pressure, temperature, and type of adsorbed molecules, is only observed for some special compounds. The main question of our present work is: does framework flexibility influence the adsorption selectivity? As a direct quantitative method to monitor the adsorption of both, carbon dioxide and methane, we make use of high-pressure in situ 13C NMR spectroscopy of 13CO2/13CH4 gas mixtures. This method allows to distinguish between the two gases as well as between adsorbed molecules and the interparticle gas phase. Gas mixture adsorption is studied under isothermal conditions. The selectivity factor for CO2 adsorption from CO2/CH4 mixtures is measured as a function of total gas pressure. The flexible material SNU-9 as well as the flexible and the nonflexible variant of DUT-8(Ni) are compared. Maximum selectivity factors for CO2 are observed for the flexible variant of DUT-8(Ni) in its open, large-pore state. In contrast, the rigid variant of DUT-8(Ni) and SNU-9 especially in its intermediate state exhibits lower adsorption selectivity factors. This observation indicates significant influence of the framework elasticity on the adsorption selectivity.
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6
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Wong YTA, Babcock TK, Chen S, Lucier BEG, Huang Y. CO Guest Interactions in SDB-Based Metal-Organic Frameworks: A Solid-State Nuclear Magnetic Resonance Investigation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:15640-15649. [PMID: 30512953 DOI: 10.1021/acs.langmuir.8b02205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Metal-organic frameworks (MOFs) are promising materials for greener carbon monoxide (CO) capture and separation processes. SDB-based (SDB = 4,4'-sulfonyldibenzoate) MOFs are particularly attractive due to their remarkable gas adsorption capacity under humid conditions. However, to the best of our knowledge, their CO adsorption abilities have yet to be investigated. In this report, CO-loaded PbSDB and CdSDB were characterized using variable-temperature (VT) 13C solid-state nuclear magnetic resonance (SSNMR) spectroscopy. These MOFs readily captured CO, with the adsorbed CO exhibiting dynamics as indicated by the temperature-dependent changes in the SSNMR spectra. Spectral simulations revealed that the CO simultaneously undergoes a localized wobbling about the adsorption site and a nonlocalized hopping between adjacent adsorption sites. The wobbling and hopping angles were also found to be temperature-dependent. From the appearance of the VT spectra and the extracted motional data, the CO adsorption mechanism was concluded to be analogous to that of CO2. To gain a better understanding on the gas adsorption properties of these MOFs and their CO capture abilities, we subsequently compared the motional data to those reported for CO2 in SDB-based MOFs and CO in MOF-74, respectively. A significant contrast in adsorption strength was observed in both cases because of the different physical properties of the guests (i.e., CO vs CO2) and the MOF frameworks (i.e., SDB-based MOFs vs MOFs with open metal sites). Our results demonstrate that SSNMR spectroscopy can be employed to probe variations in binding behavior.
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Affiliation(s)
- Y T Angel Wong
- Department of Chemistry , The University of Western Ontario , 1151 Richmond Street , London , Ontario N6A 5B7 , Canada
| | - Troy K Babcock
- Department of Chemistry , The University of Western Ontario , 1151 Richmond Street , London , Ontario N6A 5B7 , Canada
| | - Shoushun Chen
- Department of Chemistry , The University of Western Ontario , 1151 Richmond Street , London , Ontario N6A 5B7 , Canada
| | - Bryan E G Lucier
- Department of Chemistry , The University of Western Ontario , 1151 Richmond Street , London , Ontario N6A 5B7 , Canada
| | - Yining Huang
- Department of Chemistry , The University of Western Ontario , 1151 Richmond Street , London , Ontario N6A 5B7 , Canada
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7
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Wong YTA, Martins V, Lucier BEG, Huang Y. Solid-State NMR Spectroscopy: A Powerful Technique to Directly Study Small Gas Molecules Adsorbed in Metal-Organic Frameworks. Chemistry 2018; 25:1848-1853. [PMID: 30189105 DOI: 10.1002/chem.201803866] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Indexed: 12/31/2022]
Abstract
Metal-organic frameworks (MOFs) have shown great potential in gas separation and storage, and the design of MOFs for these purposes is an on-going field of research. Solid-state nuclear magnetic resonance (SSNMR) spectroscopy is a valuable technique for characterizing these functional materials. It can provide a wide range of structural and motional insights that are complementary to and/or difficult to access with alternative methods. In this Concept article, the recent advances made in SSNMR investigations of small gas molecules (i.e., carbon dioxide, carbon monoxide, hydrogen gas and light hydrocarbons) adsorbed in MOFs are discussed. These studies demonstrate the breadth of information that can be obtained by SSNMR spectroscopy, such as the number and location of guest adsorption sites, host-guest binding strengths and guest mobility. The knowledge acquired from these experiments yields a powerful tool for progress in MOF development.
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Affiliation(s)
- Y T Angel Wong
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B7, Canada
| | - Vinicius Martins
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B7, Canada
| | - Bryan E G Lucier
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B7, Canada
| | - Yining Huang
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B7, Canada
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8
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Moran RF, Dawson DM, Ashbrook SE. Exploiting NMR spectroscopy for the study of disorder in solids. INT REV PHYS CHEM 2017. [DOI: 10.1080/0144235x.2017.1256604] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Robert F. Moran
- School of Chemistry, EaStCHEM and St Andrews Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK
| | - Daniel M. Dawson
- School of Chemistry, EaStCHEM and St Andrews Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK
| | - Sharon E. Ashbrook
- School of Chemistry, EaStCHEM and St Andrews Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK
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9
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Kuttatheyil AV, Handke M, Bergmann J, Lässig D, Lincke J, Haase J, Bertmer M, Krautscheid H. 113Cd Solid-State NMR for Probing the Coordination Sphere in Metal-Organic Frameworks. Chemistry 2014; 21:1118-24. [DOI: 10.1002/chem.201405395] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Indexed: 11/12/2022]
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