High–aspect ratio zeolitic imidazolate framework (ZIF) nanoplates for hydrocarbon separation membranes

Kwon, Ohchan; Kim, Minsu; Choi, Eunji; Bae, Jun Hyuk; Yoo, Sungmi; Won, Jong Chan; Kim, Yun Ho; Shin, Jong-Il; Lee, Jong Suk; Kim, Dae Woo

doi:10.1126/sciadv.abl6841

Cited by 59 publications

(28 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only a limited number of metal–organic framework (MOF) nanosheets have been explored in MMMs for gas separation ( 17 – 22 ). Cu-BDC nanosheets [from two-dimensional (2D) layer-structured MOF] were first embedded in Matrimid polymer in a form of MMM for CO 2 /CH 4 separation ( 17 ).…”

mentioning

confidence: 99%

Rational design of mixed-matrix metal-organic framework membranes for molecular separations

Datta

Mayoral

Bettahalli

et al. 2022

Science

254

129

View full text Add to dashboard Cite

Conventional separation technologies to separate valuable commodities are energy intensive, consuming 15% of the worldwide energy. Mixed-matrix membranes, combining processable polymers and selective adsorbents, offer the potential to deploy adsorbent distinct separation properties into processable matrix. We report the rational design and construction of a highly efficient, mixed-matrix metal-organic framework membrane based on three interlocked criteria: (i) a fluorinated metal-organic framework, AlFFIVE-1-Ni, as a molecular sieve adsorbent that selectively enhances hydrogen sulfide and carbon dioxide diffusion while excluding methane; (ii) tailoring crystal morphology into nanosheets with maximally exposed (001) facets; and (iii) in-plane alignment of (001) nanosheets in polymer matrix and attainment of [001]-oriented membrane. The membrane demonstrated exceptionally high hydrogen sulfide and carbon dioxide separation from natural gas under practical working conditions. This approach offers great potential to translate other key adsorbents into processable matrix.

show abstract

mentioning

confidence: 99%

Rational design of mixed-matrix metal-organic framework membranes for molecular separations

Datta

Mayoral

Bettahalli

et al. 2022

Science

254

129

View full text Add to dashboard Cite

show abstract

“…Furthermore, island growth with low crystallinity was also observed at higher temperatures of 60 °C and 70 °C. The precise relationship between growth temperature and particle size can vary depending on other factors such as precursor concentration, solvent, reaction time, and even by substrate [32,33]. Therefore, the critical temperature and relative humidity range suitable for membrane fabrication may differ based on experimental conditions and environmental factors.…”

Section: Particle and Grain Size Distributionmentioning

confidence: 99%

Influence of Humidity and Heating Rate on the Continuous ZIF Coating during Hydrothermal Growth

Choi¹,

Lee²,

Kim³

2023

Preprint

View full text Add to dashboard Cite

Zeolitic imidazolate frameworks (ZIFs) have potential for various gas and ion separations due to their well-defined pore structure and relatively easy fabrication process compared to other metal-organic frameworks. As a result, many reports have focused on preparing polycrystalline and continuous ZIF layers on porous supports. In this study, we investigated how humidity and chamber temperature influence the structure of a ZIF-8 layer prepared by the hydrothermal method. We controlled the chamber temperature (ranging from 50 °C to 70 °C) and relative humidity (ranging from 20 % to 100 %) using a thermos-hygrostat chamber. We found that as the chamber temperature increased, ZIF-8 preferentially grew into particles rather than forming a continuous polycrystalline layer. By measuring the temperature of the reacting solution based on chamber humidity, we discovered that the heating rate of the reacting solution varied with humidity, even at the same chamber temperature. At higher humidity, thermal energy transfer was accelerated as water vapor delivered more energy to the reacting solution. Therefore, a continuous ZIF-8 layer could be formed more easily at low humidity ranges (ranging from 20 % to 40 %), while micron ZIF-8 particles were synthesized at a high heating rate. Our findings suggest that controlling the heating rate of the reacting solution is critical to preparing a continuous ZIF-8 layer, particularly for future scale-up of ZIF-8 membranes.

show abstract

“…(J–L) MMM with low-aspect-ratio nanoplate: (J) SEM image of ZIF-8 nanoplate; (K) cross-sectional SEM image of 20 wt % ZIF-8 nanoplate/6FDA-DAM; (L) gas permeation mechanism. Reproduced with permission from ref (copyright 2023 Elsevier) and from ref (CC BY-NC 4.0).…”

Section: Properties Of Mmms With Different Filler Morphologiesmentioning

confidence: 99%

“…Nanoplates, characterized by a relatively modest aspect ratio, present an alternate filler material for preparing MMMs, offering benefits akin to those of nanosheets. Unlike nanosheets, which manifest as single-crystalline structures with a solitary orientation, nanoplates adopt polycrystalline configurations comprising densely assembled particles . Nanosheets are typically obtained via direct synthesis or exfoliation from layered bulk materials, accounting for their single-crystal attributes.…”

Section: Properties Of Mmms With Different Filler Morphologiesmentioning

confidence: 99%

2D MOFs and Zeolites for Composite Membrane and Gas Separation Applications: A Brief Review

Kim,

Choi,

Lee

et al. 2023

ACS Mater. Au

Self Cite

View full text Add to dashboard Cite

Commercial membranes have predominantly been fabricated from polymers due to their economic viability and processability. This choice offers significant advantages in energy efficiency, cost-effectiveness, and operational simplicity compared to conventional separation techniques like distillation. However, polymeric membranes inherently exhibit a trade-off between their permeability and selectivity, which is summarized in the Robeson upper bound. To potentially surpass these limitations, mixed-matrix membranes (MMMs) can be an alternative solution, which can be constructed by combining polymers with inorganic additives such as metal−organic frameworks (MOFs) and zeolites. Incorporating high-aspect-ratio fillers like MOF nanosheets and zeolite nanosheets is of significant importance. This incorporation not only enhances the efficiency of separation processes but also reinforces the mechanical robustness of the membranes. We outline synthesis techniques for producing two-dimensional (2D) crystals (including nanocrystals with high aspect ratio) and provide examples of their integration into membranes to customize separation performances. Moreover, we propose a potential trajectory for research in the area of high-aspect-ratio materials-based MMMs, supported by a mathematical-model-based performance prediction.

show abstract

High–aspect ratio zeolitic imidazolate framework (ZIF) nanoplates for hydrocarbon separation membranes

Cited by 59 publications

References 67 publications

Rational design of mixed-matrix metal-organic framework membranes for molecular separations

Rational design of mixed-matrix metal-organic framework membranes for molecular separations

Influence of Humidity and Heating Rate on the Continuous ZIF Coating during Hydrothermal Growth

2D MOFs and Zeolites for Composite Membrane and Gas Separation Applications: A Brief Review

Contact Info

Product

Resources

About