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From Metal-Organic Framework Powders to Shaped Solids: Recent Developments and Challenges

Abstract : Metal-organic frameworks represent a class of porous materials which developed considerably over the past few years. Their highly porous structure makes them outperforming conventional adsorbents in hot topics such as dihydrogen and methane storage, and carbon dioxide capture. Their consequent modularity, based on the assembly of organic linkers and metal ions or clusters, also brings novel perspectives in catalysis, sensing and drug delivery just to name a few. However, one of the main bottlenecks to their broader use remains their shaping. Especially, shaped materials should present a long-term mechanical stability as well as preservation of the physical and chemical properties. This makes shaping of MOFs a special case as their thermal and chemical stabilities remain a downside as compared to other traditional porous materials such as silicas and zeolites today. Therefore, an over-increasing effort has been devoted to the shaping of these materials. In this review, the state of the art for the preparation of shaped 3D MOF-based materials is presented. Emphasis will be given to the final physical and chemical properties of the shaped solids comparatively to the initial powders, when data are available. In the first part, traditional techniques based on applying a significant force to MOF-based powders will be reviewed. These include pelletization, granulation, extrusion which generally lead to an increase of the final volumetric gas uptake of the objects. At the same time, advantages and disadvantages of each technique will be discussed as well as the main outcome on the final objects. In the second part, focus will be given on the newly-emerging techniques such as 3D printing and spray drying. The former also maximizes the volumetric gas uptake of the final materials and for both techniques the quality of the final objects heavily rely on the working parameters. Finally, the third part will include the so-called “phase separation” shaping techniques which are for the most part performed without using special techniques. This implies shaping via physical and chemical phenomena such as sublimation or precipitation. Subsequently, a discussion will be proposed on the performance of these materials for adsorption-based applications. Finally, perspectives and future outlook will be discussed.
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https://hal.univ-lille.fr/hal-03373024
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Soumis le : lundi 11 octobre 2021 - 11:46:58
Dernière modification le : mardi 12 octobre 2021 - 03:35:15

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Bakytzhan Yeskendir, Jean-Philippe Dacquin, Yannick Lorgouilloux, Christian Courtois, Sébastien Royer, et al.. From Metal-Organic Framework Powders to Shaped Solids: Recent Developments and Challenges. Materials Advances, 2021, Materials Advances, ⟨10.1039/d1ma00630d⟩. ⟨hal-03373024⟩

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