Flowability improvement of soft metal-organic framework particles by wet granulation

Ohsaki, Shuji; Nakahara, Yuka; Nakamura, Hideya; Watano, Satoru

doi:10.1016/j.micromeso.2019.109785

Cited by 8 publications

(4 citation statements)

References 43 publications

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“…Carbohydrate-based Binders. Ohsaki et al [72] showed the possibility to shape ZIF-8 powder in a mixing granulator using two different approaches: liquid or powder addition. The former implied mixing the ZIF-8 powder with a few consecutive portions of aqueous solution of the binder (hydroxypropyl cellulose) and successive steps of mixing for 5 min.…”

Section: Organic Bindersmentioning

confidence: 99%

From metal–organic framework powders to shaped solids: recent developments and challenges

et al. 2021

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Section: Organic Bindersmentioning

confidence: 99%

From metal–organic framework powders to shaped solids: recent developments and challenges

et al. 2021

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“…Experiments on adsorption showed a good separation performance for both C 2 H 4 /C 2 H 6 and C 2 H 2 /C 2 H 4 mixtures, whereby the C 2 hydrocarbon uptake capacity of the pellets is not easily influenced after molding. HPC was also used as adhesive in the wet granulation of ZIF-8 with a compact high-shear mixer in [81]; when the binder content was increased, the adsorption capacity of the ZIF-8 granules fell marginally. The gate adsorption behavior of ZIF-8, on the other hand, remained nearly constant following the granulation procedure.…”

Section: Processes With Organic Bindersmentioning

confidence: 99%

Binding Materials for MOF Monolith Shaping Processes: A Review towards Real Life Application

et al. 2022

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Metal–organic frameworks (MOFs) could be utilized for a wide range of applications such as sorption, catalysis, chromatography, energy storage, sensors, drug delivery, and nonlinear optics. However, to date, there are very few examples of MOFs exploited on a commercial scale. Nevertheless, progress in MOF-related research is currently paving the way to new industrial opportunities, fostering applications and processes interconnecting fundamental chemistry with engineering and relevant sectors. Yet, the fabrication of porous MOF materials within resistant structures is a key challenge impeding their wide commercial use for processes such as adsorptive separation. In fact, the integration of nano-scale MOF crystallic structures into bulk components that can maintain the desired characteristics, i.e., size, shape, and mechanical stability, is a prerequisite for their wide practical use in many applications. At the same time, it requires sophisticated shaping techniques that can structure nano/micro-crystalline fine powders of MOFs into diverse types of macroscopic bodies such as monoliths. Under this framework, this review aims to bridge the gap between research advances and industrial necessities for fostering MOF applications into real life. Therefore, it critically explores recent advances in the shaping and production of MOF macro structures with regard to the binding materials that have received little attention to date, but have the potential to give new perspectives in the industrial applicability of MOFs. Moreover, it proposes future paths that can be adopted from both academy and industry and can further boost MOF exploitation.

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“…However, the shaping of flexible MOFs is more complex than that of regular MOFs because of volume expansion occurring during gate opening. Several studies on the shaping of flexible MOFs have highlighted discrepancies in the gate-opening behavior between powder and molded samples. ,− For example, pelletizing MIL-53(Al) ([Al(OH)(bdc)]) with polyvinyl alcohol as a binder shifted gate opening to higher pressures. , We also reported that when ELM-11, which possesses a stacked-layer structure and exhibits gate opening owing to the expansion of the interlayer distance, was molded with polyvinylpyrrolidone (PVP), its original stepwise uptake was smeared . We recognize that these two are the same phenomenon expressed in different ways.…”

Section: Introductionmentioning

confidence: 99%

Validating the Mechanism Underlying the Slacking of the Gate-Opening Behavior in Flexible Metal–Organic Frameworks Arising from the Application of External Force

Arima

Hiraide

Miyahara

et al. 2023

ACS Appl. Mater. Interfaces

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Flexible metal−organic frameworks (MOFs) are innovative adsorbents expected to revolutionize conventional separation systems as they exhibit stepwise adsorption arising from structural transitions, commonly known as "gate opening." However, because MOFs are typically obtained in powder form, they require shaping for industrial applications. In our previous study, we reported that the stepwise uptake observed in the CO 2 gate opening of ) 2 (4,4′-bipyridine) 2 ]) became less distinct when molded with polymer binders and found that this slacking phenomenon could be caused by the polymer binder inhibiting the structural change of the ELM-11 particles. In this study, we aimed to fully validate and generalize the mechanism behind the slacking of gate adsorption from both theoretical and experimental perspectives. First, we conducted grand canonical molecular dynamics simulations for a simplified MOF model to directly calculate free energy profiles of the particle to validate the slacking theory without any assumptions. The results confirmed the fundamental assumption made in our previous study that the deformation of the flexible motifs within the MOF particles occurs sequentially, which is a key factor contributing to the slacking phenomenon. The second part of the study focused on the relationship between the volume expansion ratio of MOFs and the degree of slacking. The relationship predicted by the theory was experimentally validated by comparing ELM-11, which exhibits 30% volume expansion, to another MOF with a mutually interpenetrating jungle-gym structure, which exhibits 10% volume expansion. These findings strengthened and generalized the understanding of the mechanism underlying the slacking of gate adsorption induced upon the application of external force, which could guide the fabrication of molded MOFs while maintaining a high adsorption efficiency for various industrial applications.

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Flowability improvement of soft metal-organic framework particles by wet granulation

Cited by 8 publications

References 43 publications

From metal–organic framework powders to shaped solids: recent developments and challenges

From metal–organic framework powders to shaped solids: recent developments and challenges

Binding Materials for MOF Monolith Shaping Processes: A Review towards Real Life Application

Validating the Mechanism Underlying the Slacking of the Gate-Opening Behavior in Flexible Metal–Organic Frameworks Arising from the Application of External Force

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