Replacement of chromium by non-toxic metals in lewis-acid MOFs: Assessment of stability as glucose conversion catalysts

Ralentri Pertiwi, Ryan Oozeerally, David L. Burnett, Thomas W. Chamberlain, Nikolay Cherkasov, Marc Walker, Reza J. Kashtiban, Yuni K. Krisnandi, Volkan Degirmenci, Richard I. Walton

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10 Citations (Scopus)

Abstract

The metal-organic framework MIL-101(Cr) is known as a solid-acid catalyst for the solution conversion of biomass-derived glucose to 5-hydroxymethyl furfural (5-HMF). We study the substitution of Cr3+ by Fe3+ and Sc3+ in the MIL-101 structure in order to prepare more environmentally benign catalysts. MIL-101(Fe) can be prepared, and the inclusion of Sc is possible at low levels (10% of Fe replaced). On extended synthesis times the polymorphic MIL-88B structure instead forms.Increasing the amount of Sc also only yields MIL-88B, even at short crystallisation times. The MIL-88B structure is unstable under hydrothermal conditions, but in dimethylsulfoxide solvent, it provides 5-HMF from glucose as the major product. The optimum material is a bimetallic (Fe,Sc) form of MIL-88B, which provides ~70% conversion of glucose with 35% selectivity towards 5-HMF after 3 hours at 140 °C: this offers high conversion compared to other heterogeneous catalysts reported in the same solvent.

Original languageEnglish
Article number437
JournalCatalysts
Volume9
Issue number5
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • 5-hydroxymethyl furfural
  • Biomass
  • Fructose
  • Lewis acid
  • Metal-organic framework

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