1
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Klein RA, Bingel LW, Halder A, Carter M, Trump BA, Bloch ED, Zhou W, Walton KS, Brown CM, McGuirk CM. Adaptive Pore Opening to Form Tailored Adsorption Sites in a Cooperatively Flexible Framework Enables Record Inverse Propane/Propylene Separation. J Am Chem Soc 2023; 145:21955-21965. [PMID: 37772785 DOI: 10.1021/jacs.3c06754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/30/2023]
Abstract
A proposed low-energy alternative to the separation of alkanes from alkenes by energy-intensive cryogenic distillation is separation by porous adsorbents. Unfortunately, most adsorbents preferentially take up the desired, high-value major component alkene, requiring frequent regeneration. Adsorbents with inverse selectivity for the minor component alkane would enable the direct production of purified, reagent-grade alkene, greatly reducing global energy consumption. However, such materials are exceedingly rare, especially for propane/propylene separation. Here, we report that through adaptive and spontaneous pore size and shape adaptation to optimize an ensemble of weak noncovalent interactions, the structurally responsive metal-organic framework CdIF-13 (sod-Cd(benzimidazolate)2) exhibits inverse selectivity for propane over propylene with record-setting separation performance under industrially relevant temperature, pressure, and mixture conditions. Powder synchrotron X-ray diffraction measurements combined with first-principles calculations yield atomic-scale insight and reveal the induced fit mechanism of adsorbate-specific pore adaptation and ensemble interactions between ligands and adsorbates. Dynamic column breakthrough measurements confirm that CdIF-13 displays selectivity under mixed-component conditions of varying ratios, with a record measured selectivity factor of α ≈ 3 at 95:5 propylene:propane at 298 K and 1 bar. When sequenced with a low-cost rigid adsorbent, we demonstrated the direct purification of propylene under ambient conditions. This combined atomic-level structural characterization and performance testing firmly establishes how cooperatively flexible materials can be capable of unprecedented separation factors.
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Affiliation(s)
- Ryan A Klein
- Materials, Chemical, and Computational Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Lukas W Bingel
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Arijit Halder
- Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Marcus Carter
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Benjamin A Trump
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Eric D Bloch
- Department of Chemistry and Biochemistry, University of Delaware,Newark, Delaware 19716, United States
| | - Wei Zhou
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Krista S Walton
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Craig M Brown
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - C Michael McGuirk
- Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
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2
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Bai C, Gao Y, Zhang Z, Tu L, Cai D, Lv Z, Gao C, Xue L. Ligand Substitution: An Effective Way for Tuning Structures of ZIF-7 Nanoparticles (NPs) and Improving Energy Recovery Performance of ZIF/PA TFN Membranes. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 36913424 DOI: 10.1021/acsami.2c22701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
It is an important initiative to reduce the building energy consumption using energy recovering ventilation (ERV) systems. The application of ERV systems is hindered by the low CO2 barrier performance of commercial total heat exchange membranes (THEMs) that lead to unsatisfactory indoor air refreshing rate, and there is an urgent need for THEMs that have improved CO2 barrier properties and effective energy recovery efficiencies. Here, we report the formation of novel ZIF/PA TFN THEMs based on ZIF-7-X nanoparticles (NPs) with "core-shell" structures and tunable particle sizes, formed from benzimidazole (BIM) ligands and BIM substituted by -NH2, -CH3, -C2H5, and -C3H7 functional groups. The NPs were mixed with pyr omellitic triformyl chloride (TMC) in the organic phase during the interface polymerization process to form ZIF/PA TFN membranes. The total heat exchange performance of ZIF/PA TFN membranes could be effectively modified by the type and quantity of ZIF-7-X NPs added. The CO2 barrier properties and water vapor permeability of ZIF/PA TFN membranes could be improved by the addition of optimal levels of ZIF-7-X NPs, showing low CO2 permeance of 7.76 GPU, high H2O permeance of 663.8 GPU, and excellent enthalpy exchange efficiency of 72.1%. This work provided an effective strategy for tuning not only the nanostructures of ZIF-7 fillers but also the CO2 barrier properties of the formed ZIF/PA TFN membranes.
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Affiliation(s)
- Chaojie Bai
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Yang Gao
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Zuoqun Zhang
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Longdou Tu
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Dajian Cai
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Zixuan Lv
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Congjie Gao
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Lixin Xue
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China
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3
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Kang DY, Lee JS. Challenges in Developing MOF-Based Membranes for Gas Separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2871-2880. [PMID: 36802624 DOI: 10.1021/acs.langmuir.2c03458] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Metal-organic frameworks (MOFs) are promising candidates for membrane gas separation. MOF-based membranes include pure MOF membranes and MOF-based mixed matrix membranes (MMMs). This Perspective discusses the challenges for the next stage of the development of MOF-based membranes based on research conducted in the past decade. We focused on three major issues associated with pure MOF membranes. First, some MOF compounds have been overstudied, despite the availability of numerous MOFs. Second, gas adsorption and diffusion in MOFs are often independently investigated. The correlation between adsorption and diffusion has seldom been discussed. Third, we identify the importance of characterizing the gas distribution in MOFs to understand the structure-property relationships for gas adsorption and diffusion in MOF membranes. For MOF-based MMMs, engineering the MOF-polymer interface is essential for achieving the desired separation performance. Various approaches to modify the MOF surface or polymer molecular structure have been proposed to improve the MOF-polymer interface. Herein, we present defect engineering as a facile and efficient approach for engineering the MOF-polymer interfacial morphology and its extended application for various gas separations.
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Affiliation(s)
- Dun-Yen Kang
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
- International Graduate Program of Molecular Science and Technology, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
- Center of Atomic Initiative for New Materials, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Jong Suk Lee
- Department of Chemical and Biomolecular Engineering, Sogang University, Baekbeom-ro 35, Mapo-gu, Seoul 04107, Republic of Korea
- Institute of Emergent Materials, Sogang University, 35, Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea
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4
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Liu Y, Sim J, Hailemariam RH, Lee J, Rho H, Park KD, Kim DW, Woo YC. Status and future trends of hollow fiber biogas separation membrane fabrication and modification techniques. CHEMOSPHERE 2022; 303:134959. [PMID: 35580646 DOI: 10.1016/j.chemosphere.2022.134959] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 05/04/2022] [Accepted: 05/10/2022] [Indexed: 06/15/2023]
Abstract
With the increasing global demand for energy, renewable and sustainable biogas has attracted considerable attention. However, the presence of various gases such as methane, carbon dioxide (CO2), nitrogen, and hydrogen sulfide in biogas, and the potential emission of acid gases, which may adversely influence the environment, limits the efficient application of biogas in many fields. Consequently, researchers have focused on the upgrade and purification of biogas to eliminate impurities and obtain high-quality and high-purity biomethane with an increased combustion efficiency. In this context, the removal of CO2 gas, which is the most abundant contaminant in biogas, is of significance. Compared to conventional biogas purification processes such as water scrubbing, chemical absorption, pressure swing adsorption, and cryogenic separation, advanced membrane separation technologies are simpler to implement, easier to scale, and incur lower costs. Notably, hollow fiber membranes enhance the gas separation efficiency and decrease costs because their large specific surface area provides a greater range of gas transport. Several reviews have described biogas upgrading technologies and gas separation membranes composed of different materials. In this review, five commonly used commercial biogas upgrading technologies, as well as biological microalgae-based techniques are compared, the advantages and limitations of polymeric and mixed matrix hollow fiber membranes are highlighted, and methods to fabricate and modify hollow fiber membranes are described. This will provide more ideas and methods for future low-cost, large-scale industrial biogas upgrading using membrane technology.
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Affiliation(s)
- Yuying Liu
- Department of Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT), 283, Goyang-Daero, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 10223, Republic of Korea; Department of Chemical and Biomolecular Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Jeonghoo Sim
- Department of Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT), 283, Goyang-Daero, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 10223, Republic of Korea; Department of Civil and Environment Engineering, University of Science and Technology (UST), 217 Gajeong-Ro, Yuseong-Gu, Daejeon, 34113, Republic of Korea
| | - Ruth Habte Hailemariam
- Department of Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT), 283, Goyang-Daero, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 10223, Republic of Korea; Department of Civil and Environment Engineering, University of Science and Technology (UST), 217 Gajeong-Ro, Yuseong-Gu, Daejeon, 34113, Republic of Korea
| | - Jonghun Lee
- Department of Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT), 283, Goyang-Daero, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 10223, Republic of Korea
| | - Hojung Rho
- Department of Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT), 283, Goyang-Daero, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 10223, Republic of Korea
| | - Kwang-Duck Park
- Department of Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT), 283, Goyang-Daero, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 10223, Republic of Korea
| | - Dae Woo Kim
- Department of Chemical and Biomolecular Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea.
| | - Yun Chul Woo
- Department of Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT), 283, Goyang-Daero, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 10223, Republic of Korea; Department of Civil and Environment Engineering, University of Science and Technology (UST), 217 Gajeong-Ro, Yuseong-Gu, Daejeon, 34113, Republic of Korea.
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5
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Lu W, Huang H, Hejin Z, Yanjiao C, Xiangyu G, Fan Y, Zhong C. Efficient separation of 1,3‐butadiene from
C4
hydrocarbons by flexible metal–organic framework with gate‐opening effect. AIChE J 2022. [DOI: 10.1002/aic.17568] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Wang Lu
- State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin P. R. China
- School of Textile Science and Engineering Tiangong University Tianjin P. R. China
| | - Hongliang Huang
- State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin P. R. China
- School of Chemical Engineering Tiangong University Tianjin P. R. China
| | - Zhu Hejin
- State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin P. R. China
- School of Textile Science and Engineering Tiangong University Tianjin P. R. China
| | - Chang Yanjiao
- State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin P. R. China
- School of Chemical Engineering Tiangong University Tianjin P. R. China
| | - Guo Xiangyu
- State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin P. R. China
- School of Chemical Engineering Tiangong University Tianjin P. R. China
| | - Yang Fan
- State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin P. R. China
- School of Chemical Engineering Tiangong University Tianjin P. R. China
| | - Chongli Zhong
- State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin P. R. China
- School of Chemical Engineering Tiangong University Tianjin P. R. China
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6
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Li Y, Li H, Liu Y, Xu Z. Reversible luminescence tuning behavior in a thermal-stimuli-responsive anthracene-based coordination polymer. CrystEngComm 2022. [DOI: 10.1039/d2ce00496h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new coordination complex presented a series of structural changes accompanied by photo-fluorescence (PL) changes under different temperature stimuli.
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Affiliation(s)
- Yanli Li
- Department of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China
| | - Huijun Li
- Department of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China
| | - Yicheng Liu
- Department of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China
| | - Zhouqing Xu
- Department of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China
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7
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Yan X, Qu H, Chang Y, Duan X. Application of Metal-Organic Frameworks in Gas Pre-concentration, Pre-separation and Detection. ACTA CHIMICA SINICA 2022. [DOI: 10.6023/a22030134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Enhancing selectivity of ZIF-8 membranes by short-duration postsynthetic ligand-exchange modification. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118743] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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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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10
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Ju Z, El-Sayed ESM, Yuan D. Dynamic metal-organic frameworks for the separation of hydrogen isotopes. Dalton Trans 2020; 49:16617-16622. [PMID: 33179672 DOI: 10.1039/d0dt02806a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reversible structural transformation upon exposure to external stimuli can lead to breathing effect or gate-opening phenomena for dynamic metal-organic frameworks (MOFs), which endow them with excellent gas separation performance. The separation of hydrogen isotopes remains a huge challenge due to their nearly identical physical and chemical properties. The unique feature of dynamic MOFs, especially structural transition triggered by isotopes or by temperature, maximally enhances kinetic quantum sieving and contributes to the highly selective separation of hydrogen isotopes. Herein, we present some examples for the separation of hydrogen isotopes based on dynamic frameworks, and we expect to attract increasing attention to this research field.
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Affiliation(s)
- Zhanfeng Ju
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou 350002, China.
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11
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Ma Q, Jin H, Li Y. Tuning the Adsorption Selectivity of ZIF-8 by Amorphization. Chemistry 2020; 26:13137-13141. [PMID: 32652762 DOI: 10.1002/chem.202001249] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Indexed: 12/13/2022]
Abstract
Amorphous metal-organic frameworks (am MOFs) with a partially collapsed structure are a new category of porous hybrid materials. Here, solid-state amorphization of ZIF-8 was achieved by mechanical compression at 0.75 GPa. The compression-induced amorphous ZIF-8 (am ZIF-8) had a collapsed structure, but retained partial porosity. Benefiting from the deformed channel, the resultant am ZIF-8 exhibited preferable adsorption of C3 H6 , resulting in higher thermodynamic adsorption selectivity of C3 H6 /C3 H8 (6.72) than the crystalline counterparts (1.06). Further, am ZIF-8 achieved complete separation of an equimolar C3 H6 /C3 H8 mixture with the first breakthrough of C3 H8 . am ZIF-8 also displayed an enhancement in CO2 /N2 and CO2 /CH4 adsorption selectivities. More importantly, a self-standing am ZIF-8 membrane with boundary-free microstructure was constructed for the first time, and exhibited separation potential for H2 /CH4 , CO2 /N2 , CO2 /CH4 , and C3 H6 /C3 H8 with ideal selectivities of 14.79, 12.83, 16.23, and 2.67, respectively.
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Affiliation(s)
- Qiang Ma
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, P. R. China
| | - Hua Jin
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, P. R. China
| | - Yanshuo Li
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, P. R. China
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12
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Yang X, Zhou HL, He CT, Mo ZW, Ye JW, Chen XM, Zhang JP. Flexibility of Metal-Organic Framework Tunable by Crystal Size at the Micrometer to Submillimeter Scale for Efficient Xylene Isomer Separation. RESEARCH 2019; 2019:9463719. [PMID: 31922147 PMCID: PMC6946284 DOI: 10.34133/2019/9463719] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Accepted: 08/17/2019] [Indexed: 11/16/2022]
Abstract
Understanding, controlling, and utilizing the flexibility of adsorbents are of great importance and difficulty. Analogous with conventional solid materials, downsizing to the nanoscale is emerging as a possible strategy for controlling the flexibility of porous coordination polymers (or metal-organic frameworks). We report a unique flexibility controllable by crystal size at the micrometer to submillimeter scale. Template removal transforms [Cu2(pypz)2]·0.5p-xylene (MAF-36, Hpypz = 4-(1H-pyrazol-4-yl)pyridine) with one-dimensional channels to α-[Cu2(pypz)2] with discrete small cavities, and further heating gives a nonporous isomer β-[Cu2(pypz)2]. Both isomers can adsorb p-xylene to give [Cu2(pypz)2]·0.5p-xylene, meaning the coexistence of guest-driven flexibility and shape-memory behavior. The phase transition temperature from α-[Cu2(pypz)2] to β-[Cu2(pypz)2] decreased from ~270°C to ~150°C by increasing the crystal size from the micrometer to the submillimeter scale, ca. 2-3 orders larger than those of other size-dependent behaviors. Single-crystal X-ray diffraction showed coordination bond reconstitution and chirality inversion mechanisms for the phase transition, which provides a sufficiently high energy barrier to stabilize the metastable phase without the need of downsizing to the nanoscale. By virtue of the crystalline molecular imprinting and gate-opening effects, α-[Cu2(pypz)2] and β-[Cu2(pypz)2] show unprecedentedly high p-xylene selectivities of 16 and 51, respectively, as well as ultrafast adsorption kinetics (<2 minutes), for xylene isomers.
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Affiliation(s)
- Xiao Yang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Hao-Long Zhou
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Chun-Ting He
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Zong-Wen Mo
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Jia-Wen Ye
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Xiao-Ming Chen
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Jie-Peng Zhang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
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Abstract
Propylene/propane and ethylene/ethane separations are performed by energy-intensive distillation processes, and membrane separation may provide substantial energy and capital cost savings. Zeolitic imidazolate frameworks (ZIFs) have emerged as promising membrane materials for olefin/paraffin separation due to their tunable pore size and chemistry property, and excellent chemical and thermal stability. In this review, we summarize the recent advances on ZIF membranes for propylene/propane and ethylene/ethane separations. Membrane fabrication methods such as in situ crystallization, seeded growth, counter-diffusion synthesis, interfacial microfluidic processing, vapor-phase and current-driven synthesis are presented. The gas permeation and separation characteristics and membrane stability are also discussed.
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