From micron- to centimeter-sized MOF objects - The influence of compression on MOFs properties

J. Dhainaut (1) , J. Troyano , A. Legrand , J. Canivet (1) , I. Imaz , D. Maspoch , D. Farrusseng (1)

1 ING - IRCELYON-Ingéniérie, du matériau au réacteur

Typically, Metal-Organic Frameworks (MOFs) are prepared as sparse powders, thus showing rather low volumetric uptakes. However, in most applications restraints are dictated by the available volume. Therefore, a densification step appears necessary to make MOFs competitive against usual porous materials. Yet, substantial collapse of the structure, formed via coordination bonds, usually occurs during compression. We recently looked at the densification of several industrially-relevant MOFs: HKUST-1, and the isostructural series UiO-66, UiO-66-NH2, and UiO-67. Herein, we present the use of a R&D tableting robot to evaluate the impact of compression on the structural and textural properties of the resulting tablets, aiming at the best compromise between the tablets porosity and density. A slow densification allowed us to maintain most of the initial structure, as proved by XRD and N2 physisorption. We also mixed HKUST-1 powder with up to 2wt% of graphite to investigate its potential to minimize the effect of compression. Finally, we challenged the stability of our tablets after four months in standard room conditions.

Domaines: Catalyse; Environnement et Société

J. Dhainaut, J. Troyano, A. Legrand, J. Canivet, I. Imaz, et al.. From micron- to centimeter-sized MOF objects - The influence of compression on MOFs properties. 33ème Réunion Annuelle du Groupe Francais des Zéolithes, Mar 2017, Marne La Vallée France. ⟨hal-01493532⟩