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 (H-2 atmosphere) and catalytic transfer hydrogenation - CTH (N-2 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 H-2 and N-2 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.

Furfural Adsorption and Hydrogenation at the Oxide-Metal Interface: Evidence of the Support Influence on the Selectivity of Iridium-Based Catalysts

Dimitratos, N;
2022

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 (H-2 atmosphere) and catalytic transfer hydrogenation - CTH (N-2 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 H-2 and N-2 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.
Campisi, S; Motta, D; Barlocco, I; Stones, R; Chamberlain, TW; Chutia, A; Dimitratos, N; Villa, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/895438
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