Furfural adsorption and hydrogenation at the oxide–metal interface: evidence of the support influence on the selectivity of iridium-based catalysts

Campisi, Sebastiano, Motta, Davide, Barlocco, Ilaria , Stones, Rebecca, Chamberlain, Thomas W., Chutia, Arunabhiram, Dimitratos, Nikolaos and Villa, Alberto (2022) Furfural adsorption and hydrogenation at the oxide–metal interface: evidence of the support influence on the selectivity of iridium-based catalysts. ChemCatChem, 14 (6). ISSN 1867-3899

Full content URL: https://doi.org/10.1002/cctc.202101700

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Furfural adsorption and hydrogenation at the oxide–metal interface: evidence of the support influence on the selectivity of iridium-based catalysts
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Abstract

Here, tetrakis(hydroxymethyl)phosphonium chloride- protected colloidal iridium nanoparticles were deposited by sol- immobilisation on three different supports (CeO2, NiO and TiO2) and were investigated for the liquid-phase direct hydrogenation (H2 atmosphere) and catalytic transfer hydrogenation - CTH (N2 atmosphere) of furfural to study the effect of the H donor. The occurrence of strong-metal support interactions in 1 wt% Ir/CeO2 catalyst, as disclosed by XPS, was revealed to be responsible for the high activity observed in the direct hydrogenation (81% conversion after 6h) and for the unusual selectivity to 2- methylfuran (70%) under CTH conditions. On the other hand, Ir/NiO showed peculiar selectivity to tetrahydrofurfuryl alcohol in both H2 and N2 atmospheres (71% and 70%, respectively). The density functional theory calculations further showed that the unique selectivity of Ir/NiO may be ascribed to the adsorption properties of furfural on the support, which activates a dual-site hydrogenation mechanism.

Keywords:Furfural, direct hydrogenation, adsorption properties, Ir/NiO, Pd/NiO
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Chemistry
ID Code:47895
Deposited On:07 Apr 2022 10:49

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