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) , e202101700. 10.1002/cctc.202101700

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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 6 h) 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Publisher:	Wiley-VCH Verlag
ISSN:	1867-3880
Last Modified:	11 Apr 2022 13:45
URI:	https://orca.cardiff.ac.uk/id/eprint/148127

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