Adsorption and diffusion of carbon dioxide on ZIF-68

Liu, Yang; Kasik, Alexandra; Linneen, Nick; Liu, Jing; Lin, Youzuo

doi:10.1016/j.ces.2014.07.030

Cited by 64 publications

(48 citation statements)

References 46 publications

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“…Data analysis revealed that the smaller pore size (micropore or ultramicropores) of ZIFs is optimal for CO2 adsorption under ultralow pressure [196] . ZIFs crystals with the smaller pores (e.g., ZIF-7 and ZIF-94) showed higher CO2 adsorptions than ZIFs materials with larger pores (e.g., ZIF-11 and ZIF-93) at low pressures (<1 bar) [148] . In contrast, the opposite is true at higher pressures, i.e., the larger-pore structures showed significantly higher adsorption [148] .…”

Section: Effect Of Zifs' Properties: Structure Porosity Guest Molecul...mentioning

confidence: 93%

A Review on Removal of Carbon Dioxide (CO2) using Zeolitic Imidazolate Frameworks: Adsorption and Conversion via Catalysis

Abdelhamid

2022

Preprint

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Carbon dioxide (CO2) is one of the culprit causes of global climatic changes. Furthermore, the efficient separation of CO2 from other gaseous mixtures using ZIFs-based materials is vital for several processes such as flue gas separation, gas sweetening, and natural gas processing. Zeolitic imidazolate frameworks (ZIFs)-based materials are emerging adsorbents and catalysts for CO2 gas removal via adsorption and conversion into valuable chemicals. ZIFs-based adsorbents with high adsorption/conversion efficiencies and tunable properties can be achieved by judicious synthesis and fabrication methods. We reviewed ZIF-based materials for CO2 removal via adsorption and catalysis (e.g., cycloaddition, carboxylation, hydrogenation, N-formylation, electrocatalysis, and photocatalysis). In addition, recent development methods such as membrane synthesis and ways to improve the gas separation performance of ZIF membranes were highlighted. The prospective point of view to promote industrial applications and commercialization of ZIF-based materials was briefly discussed. Once challenges such as low performance and reproducibility for ZIFs-based materials are solved, scalability and cost-effectiveness should not become issues.

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Section: Effect Of Zifs' Properties: Structure Porosity Guest Molecul...mentioning

confidence: 93%

A Review on Removal of Carbon Dioxide (CO2) using Zeolitic Imidazolate Frameworks: Adsorption and Conversion via Catalysis

Abdelhamid

2022

Preprint

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“…[24] For ZIF-68 and 69 (GME topology), both structures exhibit significantly lower CO 2 , CH 4 , and N 2 sorption than model predictions. [25][26][27] Literature shows that the gases cause pore blockage in the HPR channels, making them inaccessible. [26,27] This behavior was not observed for hydrogen gas, with relatively small dimensions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of ZIF‐78 Morphology and Feed Composition on the Mixed Gas CO₂/N₂ Separation Performance in Mixed Matrix Membranes

Essen

Akker

Thür

et al. 2020

Adv Materials Inter

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organic linkers. The obtained ordered organic-inorganic networks exhibit high surface areas and their pore size, aperture and functionality is highly tunable, due to the variability in available organic linkers. [1] For example, a series of iron(III) carboxylate MOFs shows varying framework flexibility, pore size, pore aperture, and 3D structure by varying the carboxylate linker type. [2-6] These properties make MOFs very attractive materials in the field of gas storage and separation, since gas sorption and diffusion are tunable by linker variation. [7,8] Despite these promising characteristics, MOFs often lack chemical and thermal stability, which limits their practical application. Nonetheless, the number of stable MOFs has been increasing over the years. [9] One subclass of thermally and chemically stable MOFs are zeolitic imidazolate frameworks (ZIFs), which consist out of zinc or cobalt cations and a variety of imidazolate linkers. Since the first reported ZIFs, many new ZIF structures and topologies have been unraveled. [10] Due to their versatility, stability, and microporous nature (i.e., high gas uptake), multiple ZIF containing membrane structures have been investigated for gas separation purposes. [11,12] By the use of high-throughput synthesis, ZIF structures analogous to the zeolite gmelinite (GME) topology were found, which exhibited extraordinary high CO 2 uptake. [13] These hexagonal anisotropic GME ZIF crystals have two 1D channel types (one pore exists out of KNO cages, with pore apertures ranging from 4.5 to 8 Å, the other out of alternating GME and HPR cages, with pore apertures ranging from 3.6 to 4.3 Å) that are oriented parallel along the c-axis of the crystal structure (Figure 1). [14,15] GME ZIFs are constructed by linking Zn 2+ with 2-nitroimidazolate (nIm) and another imidazolate linker, where the other imidazolate linker determines the pore size, aperture, and polarity. [13,14] Controlling size and shape of the mixed linker ZIFs is rather difficult, since the difference in pK a values between the variable imidazoles and 2-nitroimidazole (nIm) causes different degrees of deprotonation in the reaction mixture. [16] Nonetheless, for ZIF-69 and 78 (both with GME topology) it was shown that their size and aspect ratio could be controlled by using specific zinc salts and deprotonating agents and adapting the ratio between zinc and the imidazoles. [17-19] In this work, the influence of the zeolitic imidazolate framework 78 (ZIF-78) morphology, with 1D pores, on the mixed matrix membrane (MMM) CO 2 /N 2 mixed gas separation performance is investigated as well as the influence of the feed composition and pressure. Low aspect ratio and a high aspect ratio ZIF-78 particles are synthesized and incorporated in Matrimid with 10 and 20 wt% additive content. High pressure CO 2 and N 2 sorption measurements show that both the low and high aspect ratio ZIF-78 metal-organic frameworks (MOFs) exhibit similar sorption behavior. The incorporation of ZIF-78 into Matrimid results in improved CO 2 permeabilit...

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“…ZIFs are composed of transition-metal ions bridged by imidazolate linkers in a manner similar to the Si-O bond in zeolites [28,47,49,50]. The zeolite-like topology has endowed ZIFs with superior thermal and chemical stabilities to the MOFs reported earlier such as MOF-5.…”

Section: Introductionmentioning

confidence: 99%

“…The zeolite-like topology has endowed ZIFs with superior thermal and chemical stabilities to the MOFs reported earlier such as MOF-5. In addition, the aperture sizes of most ZIFs are precisely defined in the range of 3 to 5 Å, making them highly kinetically selective for gas molecules with sub-ångström size difference [49,51,52]. To use ZIFs for membrane applications, one approach is to incorporate nanoscale ZIF crystals in polymer membranes to form mixed matrix membranes (MMMs) (Figure 1a) and the other is to fabricate continuous thin film ZIF membranes on top of macro or mesoporous supports (Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

Zeolitic Imidazolate Framework Membranes for Light Olefin/Paraffin Separation

Liu

2018

Crystals

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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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Adsorption and diffusion of carbon dioxide on ZIF-68

Cited by 64 publications

References 46 publications

A Review on Removal of Carbon Dioxide (CO2) using Zeolitic Imidazolate Frameworks: Adsorption and Conversion via Catalysis

A Review on Removal of Carbon Dioxide (CO2) using Zeolitic Imidazolate Frameworks: Adsorption and Conversion via Catalysis

Investigation of ZIF‐78 Morphology and Feed Composition on the Mixed Gas CO₂/N₂ Separation Performance in Mixed Matrix Membranes

Zeolitic Imidazolate Framework Membranes for Light Olefin/Paraffin Separation

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Adsorption and diffusion of carbon dioxide on ZIF-68

Cited by 64 publications

References 46 publications

A Review on Removal of Carbon Dioxide (CO2) using Zeolitic Imidazolate Frameworks: Adsorption and Conversion via Catalysis

A Review on Removal of Carbon Dioxide (CO2) using Zeolitic Imidazolate Frameworks: Adsorption and Conversion via Catalysis

Investigation of ZIF‐78 Morphology and Feed Composition on the Mixed Gas CO2/N2 Separation Performance in Mixed Matrix Membranes

Zeolitic Imidazolate Framework Membranes for Light Olefin/Paraffin Separation

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Investigation of ZIF‐78 Morphology and Feed Composition on the Mixed Gas CO₂/N₂ Separation Performance in Mixed Matrix Membranes