Issue 12, 2020

Unexpected linker-dependent Brønsted acidity in the (Zr)UiO-66 metal organic framework and application to biomass valorization

Abstract

The catalytic activity of UiO-66 type Zr metal–organic frameworks can be tuned by the linker employed, e.g. nitro- or aminoterephthalic acid. Here we study composition–activity relations for the UiO-66 catalyzed dehydration of fructose into hydroxymethylfurfural, a carbon-neutral feedstock for chemicals and fuels. Variation of the substituents on the NO2/NH2 functionalized solids has a clear influence on the number of missing linkers around the Zr oxo clusters, on the hydrophobicity/hydrophilicity of the eventual metal–organic framework and on the Brønsted acidity. The thermally modulated UiO-66-NH2 is able to yield 25 molecules of HMF per defective Zr site after 1 h at 100 °C, maintaining its activity in 4 consecutive runs.

Graphical abstract: Unexpected linker-dependent Brønsted acidity in the (Zr)UiO-66 metal organic framework and application to biomass valorization

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2020
Accepted
23 May 2020
First published
27 May 2020

Catal. Sci. Technol., 2020,10, 4002-4009

Unexpected linker-dependent Brønsted acidity in the (Zr)UiO-66 metal organic framework and application to biomass valorization

G. Fu, F. G. Cirujano, A. Krajnc, G. Mali, M. Henrion, S. Smolders and D. E. De Vos, Catal. Sci. Technol., 2020, 10, 4002 DOI: 10.1039/D0CY00638F

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