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Issue 10, 2020
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Optimized preparation and regeneration of MFI type base catalysts for d-glucose isomerization in water

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Abstract

The isomerization of D-glucose to D-fructose is an important transformation in food and biomass chemistry, for which the use of robust heterogeneous catalysts instead of restrictive enzyme-based systems is desirable, although continues to be very challenging. Herein, solid base catalysts possessing a relatively robust hierarchical MFI structure and (non-toxic) alkali (M = Na, K) and alkaline-earth (Me = Ca, Mg) metals were prepared via top-down strategies and characterized via complementary techniques. The catalyst preparation and regeneration conditions were optimized to achieve superior performances. The highest catalyst stability was reached for the Mg, K-containing hierarchical zeotype prepared via solid-state impregnation (SSI) of Mg, which led to 65% D-fructose selectivity at 45% conversion, 100 °C, 2 h, or 99% selectivity at 26% conversion, 75 °C. The SSI is an up-scalable process which advantageously avoids the use of solvents, pre-preparation of alkaline liquid solutions and solvent evaporation stages for manufacturing eco-friendly catalysts.

Graphical abstract: Optimized preparation and regeneration of MFI type base catalysts for d-glucose isomerization in water

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Article information


Submitted
29 Jan 2020
Accepted
17 Apr 2020
First published
20 Apr 2020

Catal. Sci. Technol., 2020,10, 3232-3246
Article type
Paper

Optimized preparation and regeneration of MFI type base catalysts for D-glucose isomerization in water

M. M. Antunes, A. Fernandes, D. Falcão, M. Pillinger, F. Ribeiro and A. A. Valente, Catal. Sci. Technol., 2020, 10, 3232
DOI: 10.1039/D0CY00188K

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