NiCo and NiCo Decorated with Ru Nanoparticles for Magnetically Induced Hydroprocessing of Lignin Models
Résumé
A series of bimetallic Ni10−xCox (x: 2, 3, 4, 5)
nanoparticles have been prepared using the organometallic
approach from Ni[iPrNC(CH3)NiPr]2 and Co[N(SiMe3)2]2(thf)
precursors. Structural characterization by high-resolution transmission electron microscopy (HR-TEM), X-ray absorption spectroscopy (XAS), and X-ray diffraction (XRD) revealed a bimetallic
structure with a face-centered cubic (fcc) Ni-rich core and
ultrasmall (≤2 nm) hcp Co nanoparticles decorating it. Magnetic
and magnetic hyperthermia properties were measured by vibrating
sample magnetometry (VSM) and calorimetry, respectively.
Moreover, the Ni7Co3 composition was shown to be a stable
heterogeneous catalyst for diphenyl ether (DPE) hydrogenation
under magnetic induction. Remarkably, the Ni7Co3 system before
and after its decoration with a small amount of Ru (1 wt %) was transposed to the low-pressure hydrogenation of lignin-linkage
models and lignin-oil molecules. The results showed that the system had moderate activity in cleaving different ether C−O bonds
and was effective in upgrading lignin oils through hydrodeoxygenation (HDO), with a significant preference to produce
cyclohexanols. This study represents a significant step toward applications of magnetic-induced catalysis in the field of biomass
valorization.
Domaines
ChimieOrigine | Fichiers produits par l'(les) auteur(s) |
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