NDLI: Gel-based morphological design of zirconium metal

Content Provider	Royal Society of Chemistry (RSC)
Author	Keen, David A. Willhammar, Tom Bueken, Bart Velthoven, Niels Van Baron, Gino V. Ameloot, Rob Vos, Dirk De Stassen, Ivo Denayer, Joeri F. M. Stassin, Timothée Bals, Sara Bennett, Thomas D.
Copyright Year	2017
Abstract	The ability of metal–organic frameworks (MOFs) to gelate under specific synthetic conditions opens up new opportunities in the preparation and shaping of hierarchically porous MOF monoliths, which could be directly implemented for catalytic and adsorptive applications. In this work, we present the first examples of xero- or aerogel monoliths consisting solely of nanoparticles of several prototypical Zr4+-based MOFs: UiO-66-X (X = H, NH2, NO2, (OH)2), UiO-67, MOF-801, MOF-808 and NU-1000. High reactant and water concentrations during synthesis were observed to induce the formation of gels, which were converted to monolithic materials by drying in air or supercritical CO2. Electron microscopy, combined with N2 physisorption experiments, was used to show that irregular nanoparticle packing leads to pure MOF monoliths with hierarchical pore systems, featuring both intraparticle micropores and interparticle mesopores. Finally, UiO-66 gels were shaped into monolithic spheres of 600 μm diameter using an oil-drop method, creating promising candidates for packed-bed catalytic or adsorptive applications, where hierarchical pore systems can greatly mitigate mass transfer limitations.
Starting Page	3939
Ending Page	3948
Page Count	10
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	8
Issue Number	5
Journal	Chemical Science
DOI	10.1039/c6sc05602d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Electron microscope MOF Xero (software) Aerogel Nanoparticle Micrometre Supercritical fluid Physisorption
Content Type	Text
Resource Type	Article
Subject	Chemistry

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