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Download fileEnhanced Stability of the Metal–Organic Framework MIL-101(Cr) by Embedding Pd Nanoparticles for Densification through Compression
journal contribution
posted on 2022-03-15, 13:06 authored by Anna Celeste, Francesco Capitani, Pierre Fertey, Annalisa Paolone, Ferenc Borondics, Oana Grad, Gabriela Blanita, Claudia ZloteaMetal–organic
frameworks (MOFs) are ideal platforms for
new and original functionalization, as the confinement of metallic
nanoparticles (NPs) within their pores. However, the insertion of
NPs could impact the framework’s mechanical stability, thus
affecting their performances in applications. Indeed, MOFs are usually
loose powders that need to be compressed to increase the volumetric
density before being employed as gas adsorbers. Here, we investigate
the high-pressure behavior of the mesoporous MOF MIL-101 loaded with
Pd NPs (20, 35 wt %) by synchrotron X-ray diffraction and infrared
spectroscopy. The control of the metal content allows us to demonstrate
that Pd NPs enhance the mechanical stability of MIL-101, with the
bulk modulus and the crystalline–amorphous transition pressure
increasing with the Pd loading. This is attributed to the NP steric
hindrance, whereas the presence of host–guest chemical interactions
is ruled out by infrared spectroscopy. We also define a spectroscopic
quantity highlighting the framework amorphization that can be exploited
from now on to characterize these materials when densified. Our results
demonstrate that the incorporation of NPs makes MOFs not only more
functional but also more mechanically stable and thus suitable for
densification.
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usually loose powdersspectroscopic quantity highlightingnp steric hindrance35 wt %)nps could impactmesoporous mof milembedding pd nanoparticlespd nps enhancenps makes mofspd npspd loadingmetallic nanoparticlesvolumetric densitythus suitablethus affectingsynchrotron xray diffractionpressure behaviororiginal functionalizationmechanically stablemechanical stabilityinfrared spectroscopyideal platformsgas adsorbersframework ’framework amorphizationenhanced stabilitybulk modulus