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Schneemann A, Jing Y, Evans JD, Toyao T, Hijikata Y, Kamiya Y, Shimizu KI, Burtch NC, Noro SI. Alkyl decorated metal-organic frameworks for selective trapping of ethane from ethylene above ambient pressures. Dalton Trans 2021; 50:10423-10435. [PMID: 34240094 DOI: 10.1039/d1dt01477c] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The trapping of paraffins is beneficial compared to selective olefin adsorption for adsorptive olefin purification from a process engineering point of view. Here we demonstrate the use of a series of Zn2(X-bdc)2(dabco) (where X-bdc2- is bdc2- = 1,4-benzenedicarboxylate with substituting groups X, DM-bdc2- = 2,5-dimethyl-1,4-benzenedicarboxylate or TM-bdc2- = 2,3,5,6-tetramethyl-1,4-benzenedicarboxylate and dabco = diazabicyclo[2.2.2.]octane) metal-organic frameworks (MOFs) for the adsorptive removal of ethane from ethylene streams. The best performing material from this series is Zn2(TM-bdc)2(dabco) (DMOF-TM), which shows a high ethane uptake of 5.31 mmol g-1 at 110 kPa, with a good IAST selectivity of 1.88 towards ethane over ethylene. Through breakthrough measurements a high productivity of 13.1 L kg-1 per breakthrough is revealed with good reproducibility over five consecutive cycles. Molecular simulations show that the methyl groups of DMOF-TM are forming a van der Waals trap with the methylene groups from dabco, snuggly fitting the ethane. Further, rarely used high pressure coadsorption measurements, in pressure regimes that most scientific studies on hydrocarbon separation on MOFs ignore, reveal an increase in ethane capacity and selectivity for binary mixtures with increased pressures. The coadsorption measurements reveal good selectivity of 1.96 at 1000 kPa, which is verified also through IAST calculations up to 3000 kPa. This study overall showcases the opportunities that pore engineering by alkyl group incorporation and pressure increase offer to improve hydrocarbon separation in reticular materials.
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Affiliation(s)
- Andreas Schneemann
- Sandia National Laboratories, 7011 East Avenue, Livermore, CA 94550, USA.
| | - Yuan Jing
- Institute for Catalysis, Hokkaido University, Sapporo 001-0020, Japan
| | - Jack D Evans
- Lehrstuhl für Anorganische Chemie, Technische Universität Dresden, Bergstr. 66, 01069 Dresden, Germany
| | - Takashi Toyao
- Institute for Catalysis, Hokkaido University, Sapporo 001-0020, Japan and Elements Strategy Initiative for Catalysis and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
| | - Yuh Hijikata
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan
| | - Yuichi Kamiya
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan.
| | - Ken-Ichi Shimizu
- Institute for Catalysis, Hokkaido University, Sapporo 001-0020, Japan and Elements Strategy Initiative for Catalysis and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
| | - Nicholas C Burtch
- Sandia National Laboratories, 7011 East Avenue, Livermore, CA 94550, USA.
| | - Shin-Ichiro Noro
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan.
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2
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Baxter SJ, Schneemann A, Ready AD, Wijeratne P, Wilkinson AP, Burtch NC. Tuning Thermal Expansion in Metal–Organic Frameworks Using a Mixed Linker Solid Solution Approach. J Am Chem Soc 2019; 141:12849-12854. [DOI: 10.1021/jacs.9b06109] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Samuel J. Baxter
- Sandia National Laboratory, Livermore, California 94550, United States
| | | | - Austin D. Ready
- Sandia National Laboratory, Livermore, California 94550, United States
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Bhattacharya S, Ayass WW, Taffa DH, Schneemann A, Semrau AL, Wannapaiboon S, Altmann PJ, Pöthig A, Nisar T, Balster T, Burtch NC, Wagner V, Fischer RA, Wark M, Kortz U. Discovery of Polyoxo-Noble-Metalate-Based Metal–Organic Frameworks. J Am Chem Soc 2019; 141:3385-3389. [DOI: 10.1021/jacs.8b13397] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Saurav Bhattacharya
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Wassim W. Ayass
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Dereje H. Taffa
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
| | - Andreas Schneemann
- Technical University of Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | - A. Lisa Semrau
- Technical University of Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | | | - Philipp J. Altmann
- Technical University of Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Alexander Pöthig
- Technical University of Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Talha Nisar
- Department of Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Torsten Balster
- Department of Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Nicholas C. Burtch
- Sandia National Laboratories, Livermore, California 94551, United States
| | - Veit Wagner
- Department of Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Roland A. Fischer
- Technical University of Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Michael Wark
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
| | - Ulrich Kortz
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
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Burtch NC, Heinen J, Bennett TD, Dubbeldam D, Allendorf MD. Mechanical Properties in Metal-Organic Frameworks: Emerging Opportunities and Challenges for Device Functionality and Technological Applications. Adv Mater 2018; 30:e1704124. [PMID: 29149545 DOI: 10.1002/adma.201704124] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2017] [Revised: 09/11/2017] [Indexed: 05/03/2023]
Abstract
Some of the most remarkable recent developments in metal-organic framework (MOF) performance properties can only be rationalized by the mechanical properties endowed by their hybrid inorganic-organic nanoporous structures. While these characteristics create intriguing application prospects, the same attributes also present challenges that will need to be overcome to enable the integration of MOFs with technologies where these promising traits can be exploited. In this review, emerging opportunities and challenges are identified for MOF-enabled device functionality and technological applications that arise from their fascinating mechanical properties. This is discussed not only in the context of their more well-studied gas storage and separation applications, but also for instances where MOFs serve as components of functional nanodevices. Recent advances in understanding MOF mechanical structure-property relationships due to attributes such as defects and interpenetration are highlighted, and open questions related to state-of-the-art computational approaches for quantifying their mechanical properties are critically discussed.
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Affiliation(s)
| | - Jurn Heinen
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Thomas D Bennett
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
| | - David Dubbeldam
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
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Heinen J, Ready AD, Bennett TD, Dubbeldam D, Friddle RW, Burtch NC. Elucidating the Variable-Temperature Mechanical Properties of a Negative Thermal Expansion Metal-Organic Framework. ACS Appl Mater Interfaces 2018; 10:21079-21083. [PMID: 29873475 DOI: 10.1021/acsami.8b06604] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report the first experimental study into the thermomechanical and viscoelastic properties of a metal-organic framework (MOF) material. Nanoindentations show a decrease in the Young's modulus, consistent with classical molecular dynamics simulations, and hardness of HKUST-1 with increasing temperature over the 25-100 °C range. Variable-temperature dynamic mechanical analysis reveals significant creep behavior, with a reduction of 56% and 88% of the hardness over 10 min at 25 and 100 °C, respectively. This result suggests that, despite the increased density that results from increasing temperature in the negative thermal expansion MOF, the thermally induced softening due to vibrational and entropic contributions plays a more dominant role in dictating the material's temperature-dependent mechanical behavior.
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Affiliation(s)
- Jurn Heinen
- Van't Hoff Institute for Molecular Sciences , University of Amsterdam , Science Park 904 , 1098 XH Amsterdam , The Netherlands
| | - Austin D Ready
- Sandia National Laboratories , 7011 East Avenue , Livermore , California 94551 , United States
| | - Thomas D Bennett
- Department of Materials Science and Metallurgy , University of Cambridge , 27 Charles Babbage Road , Cambridge CB3 0FS , United Kingdom
| | - David Dubbeldam
- Van't Hoff Institute for Molecular Sciences , University of Amsterdam , Science Park 904 , 1098 XH Amsterdam , The Netherlands
| | - Raymond W Friddle
- Sandia National Laboratories , 7011 East Avenue , Livermore , California 94551 , United States
| | - Nicholas C Burtch
- Sandia National Laboratories , 7011 East Avenue , Livermore , California 94551 , United States
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6
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Abstract
![]()
Constructing functional
forms and their corresponding force field
parameters for the metal–linker interface of metal–organic
frameworks is challenging. We propose fitting these parameters on
the elastic tensor, computed from ab initio density functional theory
calculations. The advantage of this top-down approach is that it becomes
evident if functional forms are missing when components of the elastic
tensor are off. As a proof-of-concept, a new flexible force field
for MIL-47(V) is derived. Negative thermal expansion is observed and
framework flexibility has a negligible effect on adsorption and transport
properties for small guest molecules. We believe that this force field
parametrization approach can serve as a useful tool for developing
accurate flexible force field models that capture the correct mechanical
behavior of the full periodic structure.
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Affiliation(s)
- Jurn Heinen
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Nicholas C Burtch
- Sandia National Laboratories , Livermore, California 94551, United States
| | - Krista S Walton
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive Northwest, Atlanta, Georgia 30332, United States
| | - David Dubbeldam
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands
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7
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Stassen I, Burtch NC, Talin AA, Falcaro P, Allendorf MD, Ameloot R. Correction: An updated roadmap for the integration of metal–organic frameworks with electronic devices and chemical sensors. Chem Soc Rev 2017; 46:3853. [DOI: 10.1039/c7cs90048a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for ‘An updated roadmap for the integration of metal–organic frameworks with electronic devices and chemical sensors’ by Ivo Stassen et al., Chem. Soc. Rev., 2017, DOI: 10.1039/c7cs00122c.
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Affiliation(s)
- Ivo Stassen
- Centre for Surface Chemistry and Catalysis
- KU Leuven – University of Leuven
- Celestijnenlaan 200F
- B-3001 Leuven
- Belgium
| | | | | | - Paolo Falcaro
- Institute of Physical and Theoretical Chemistry
- Graz University of Technology
- 8010 Graz
- Austria
- Department of Chemistry
| | | | - Rob Ameloot
- Centre for Surface Chemistry and Catalysis
- KU Leuven – University of Leuven
- Celestijnenlaan 200F
- B-3001 Leuven
- Belgium
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8
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Heinen J, Burtch NC, Walton KS, Fonseca Guerra C, Dubbeldam D. Predicting Multicomponent Adsorption Isotherms in Open-Metal Site Materials Using Force Field Calculations Based on Energy Decomposed Density Functional Theory. Chemistry 2016; 22:18045-18050. [DOI: 10.1002/chem.201603895] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Jurn Heinen
- Van‘t Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1098X Amsterdam The Netherlands
| | - Nicholas C. Burtch
- School of Chemical and Biomolecular Engineering; Georgia Institute of Technology; 311 Ferst Drive NW Atlanta Georgia 30332 US
| | - Krista S. Walton
- School of Chemical and Biomolecular Engineering; Georgia Institute of Technology; 311 Ferst Drive NW Atlanta Georgia 30332 US
| | - Célia Fonseca Guerra
- Department of Theoretical Chemistry and Amsterdam Center for Multiscale Modeling; Vrije Universiteit Amsterdam; De Boelelaan 1083 1081 HV Amsterdam The Netherlands
| | - David Dubbeldam
- Van‘t Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1098X Amsterdam The Netherlands
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9
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Jiao Y, Morelock CR, Burtch NC, Mounfield WP, Hungerford JT, Walton KS. Tuning the Kinetic Water Stability and Adsorption Interactions of Mg-MOF-74 by Partial Substitution with Co or Ni. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b03843] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yang Jiao
- School of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Cody R. Morelock
- School of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Nicholas C. Burtch
- School of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - William P. Mounfield
- School of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Julian T. Hungerford
- School of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Krista S. Walton
- School of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
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10
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Burtch NC, Walton KS. Modulating adsorption and stability properties in pillared metal-organic frameworks: a model system for understanding ligand effects. Acc Chem Res 2015; 48:2850-7. [PMID: 26529060 DOI: 10.1021/acs.accounts.5b00311] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Metal-organic frameworks (MOFs) are nanoporous materials with highly tunable properties that make them ideal for a wide array of adsorption applications. Through careful choice of metal and ligand precursors, one can target the specific functionality and pore characteristics desired for the application of interest. However, among the wide array of MOFs reported in the literature, there are varying trends in the effects that ligand identity has on the adsorption, chemical stability, and intrinsic framework dynamics of the material. This is largely due to ligand effects being strongly coupled with structural properties arising from the differing topologies among frameworks. Given the important role such properties play in dictating adsorbent performance, understanding these effects will be critical for the design of next generation functional materials. Pillared MOFs are ideal platforms for understanding how ligand properties can affect the adsorption, stability, and framework dynamics in MOFs. In this Account, we highlight our recent work demonstrating how experiment and simulation can be used to understand the important role ligand identity plays in governing the properties of isostructural MOFs containing interconnected layers pillared by bridging ligands. Changing the identity of the linear, ditopic ligand in either the 2-D layer or the pillaring third dimension allows targeted modulation of the chemical functionality, porosity, and interpenetration of the framework. We will discuss how these characteristics can have important consequences on the adsorption, chemical stability, and dynamic properties of pillared MOFs. The structures discussed in this Account comprise the greatest diversity of isostructural MOFs whose stability properties have been studied, allowing valuable insight into how ligand properties dictate the chemical stability of isostructural frameworks. We also discuss how functional groups can affect adsorbate energetics at their most favorable adsorption sites to elucidate how functional groups can affect the adsorptive performance of these materials in ways that are unexpected based on the isolated ligand's properties. We then highlight a variety of simulation tools that not only can be used to understand the differing molecular-level behavior of the adsorbate and framework dynamics within these isostructural MOFs, but also can shed light on possible mechanisms that govern the differing chemical stability properties among these materials. Lastly, we provide perspective on the challenges and opportunities for utilizing the structure-property relationships arising from the ligand effects described in this Account for the design of further MOFs with enhanced chemical stability and adsorption properties.
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Affiliation(s)
- Nicholas C. Burtch
- School
of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Krista S. Walton
- School
of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
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12
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Burtch NC, Torres-Knoop A, Foo GS, Leisen J, Sievers C, Ensing B, Dubbeldam D, Walton KS. Understanding DABCO Nanorotor Dynamics in Isostructural Metal-Organic Frameworks. J Phys Chem Lett 2015; 6:812-816. [PMID: 26262657 DOI: 10.1021/jz502653y] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Flexible framework dynamics present in the subset of metal-organic frameworks known as soft porous crystals give rise to interesting structural properties that are unique to this class of materials. In this work, we use experiments and molecular simulation to understand the highly dynamic nanorotor behavior of the 1,4-diazabicyclo[2.2.2]octane (DABCO) ligand in the pillared Zn-DMOF and Zn-DMOF-TM (TM = tetramethyl) structures. While DABCO is known to be displaced in the presence of water in the parent Zn-DMOF structure, the Zn-DMOF-TM variation is highly stable even after adsorbing significant amounts of water vapor. The dynamics of DABCO in the presence of water guest molecules is therefore also explored in the Zn-DMOF-TM structure via in situ NMR and IR experiments. This analysis shows that the rotational motion of the DABCO linkers is dependent on water content, but not a likely source of water instability because the dynamics are fast and largely unaffected by the presence of methyl functional groups.
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Affiliation(s)
- Nicholas C Burtch
- †School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Ariana Torres-Knoop
- ‡Van't Hoff Institute for Molecular Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - Guo Shiou Foo
- †School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Johannes Leisen
- §School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Carsten Sievers
- †School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Bernd Ensing
- ‡Van't Hoff Institute for Molecular Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - David Dubbeldam
- ‡Van't Hoff Institute for Molecular Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - Krista S Walton
- †School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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Jasuja H, Jiao Y, Burtch NC, Huang YG, Walton KS. Synthesis of cobalt-, nickel-, copper-, and zinc-based, water-stable, pillared metal-organic frameworks. Langmuir 2014; 30:14300-7. [PMID: 25325734 DOI: 10.1021/la503269f] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The performance of metal-organic frameworks (MOFs) in humid or aqueous environments is a topic of great significance for a variety of applications ranging from adsorption separations to gas storage. While a number of water-stable MOFs have emerged recently in the literature, the majority of MOFs are known to have poor water stability compared to zeolites and activated carbons, and there is therefore a critical need to perform systematic water-stability studies and characterize MOFs comprehensively after water exposure. Using these studies we can isolate the specific factors governing the structural stability of MOFs and direct the future synthesis efforts toward the construction of new, water-stable MOFs. In this work, we have extended our previous work on the systematic water-stability studies of MOFs and synthesized new, cobalt-, nickel-, copper-, and zinc-based, water-stable, pillared MOFs by incorporating structural factors such as ligand sterics and catenation into the framework. Stability is assessed by using water vapor adsorption isotherms along with powder X-ray diffraction patterns and results from BET modeling of N2 adsorption isotherms before and after water exposure. As expected, our study demonstrates that unlike the parent DMOF structures (based on Co, Ni, Cu, and Zn metals), which all collapse under 60% relative humidity (RH), their corresponding tetramethyl-functionalized variations (DMOF-TM) are remarkably stable, even when adsorbing more than 20 mmol of H2O/g of MOF at 80% RH. This behavior is due to steric factors provided by the methyl groups grafted on the BDC (benzenedicarboxylic acid) ligand, as shown previously for the Zn-based DMOF-TM. Moreover, 4,4',4″,4‴-benzene-1,2,4,5-tetrayltetrabenzoic acid based, pillared MOFs (based on Co and Zn metals) are also found to be stable after 90% RH exposure, even when the basicity of the bipyridyl-based pillar ligand is low. This is due to the presence of catenation in their frameworks, similar to MOF-508 (Zn-BDC-BPY), which has also been reported to be stable after exposure to 90% RH.
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Affiliation(s)
- Himanshu Jasuja
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive Northwest, Atlanta, Georgia 30332, United States
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14
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Affiliation(s)
- Nicholas C. Burtch
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Himanshu Jasuja
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Krista S. Walton
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
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15
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Burtch NC, Jasuja H, Dubbeldam D, Walton KS. Molecular-level Insight into Unusual Low Pressure CO2 Affinity in Pillared Metal–Organic Frameworks. J Am Chem Soc 2013; 135:7172-80. [DOI: 10.1021/ja310770c] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Nicholas C. Burtch
- School of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Himanshu Jasuja
- School of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - David Dubbeldam
- Van’t Hoff Institute
for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166 Amsterdam, The Netherlands
| | - Krista S. Walton
- School of Chemical and Biomolecular
Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
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16
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Jasuja H, Burtch NC, Huang YG, Cai Y, Walton KS. Kinetic water stability of an isostructural family of zinc-based pillared metal-organic frameworks. Langmuir 2013; 29:633-642. [PMID: 23214448 DOI: 10.1021/la304204k] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The rational design of metal-organic frameworks (MOFs) with structural stability in the presence of humid conditions is critical to the commercialization of this class of materials. However, the systematic water stability studies required to develop design criteria for the construction of water-stable MOFs are still scarce. In this work, we show that by varying the functional groups on the 1,4-benzenedicarboxylic acid (BDC) linker of DMOF [Zn(BDC)(DABCO)(0.5)], we can systematically tune the kinetic water stability of this isostructural, pillared family of MOFs. To illustrate this concept, we have performed water adsorption studies on four novel, methyl-functionalized DMOF variations along with a number of already reported functionalized analogues containing polar (fluorine) and nonpolar (methyl) functional groups on the BDC ligand. These results are distinctly different from previous reports where the apparent water stability is improved through the inclusion of functional groups such as -CH(3), -C(2)H(5), and -CF(3) which only serve to prevent significant amounts of water from adsorbing into the pores. In this study, we present the first demonstration of tuning the inherent kinetic stability of MOF structures in the presence of large amounts of adsorbed water. Notably, we demonstrate that while the parent DMOF structure is unstable, the DMOF variation containing the tetramethyl BDC ligand remains fully stable after adsorbing large amounts of water vapor during cyclic water adsorption cycles. These trends cannot be rationalized in terms of hydrophobicity alone; experimental water isotherms show that MOFs containing the same number of methyl groups per unit cell will have different kinetic stabilities and that the precise placements of the methyl groups on the BDC ligand are therefore critically important in determining their stability in the presence of water. We present the water adsorption isotherms, PXRD (powder X-ray diffraction) patterns, and BET surface areas before and after water exposure to illustrate these trends. Furthermore, we shed light on the important distinction between kinetic and thermodynamic stability in MOFs. Molecular simulations are also used to provide insight into the structural characteristics governing these trends in kinetic water stability.
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Affiliation(s)
- Himanshu Jasuja
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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