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

authors	Antunes, MM; Fernandes, A; Falcao, D; Pillinger, M; Ribeiro, F; Valente, AA
nationality	International
journal	CATALYSIS SCIENCE & TECHNOLOGY
keywords	TO-FRUCTOSE ISOMERIZATION; MESOPOROUS ZSM-5; FAST PYROLYSIS; OXYGENATED HYDROCARBONS; ALKALINE-DEGRADATION; BIOMASS CONVERSION; ZEOLITE CATALYSTS; AQUEOUS GLUCOSE; ACID CATALYSTS; SN-MFI
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 degrees C, 2 h, or 99% selectivity at 26% conversion, 75 degrees 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.
publisher	ROYAL SOC CHEMISTRY
issn	2044-4753
isbn	2044-4761
year published	2020
volume	10
issue	10
beginning page	3232
ending page	3246
digital object identifier (doi)	10.1039/d0cy00188k
web of science category	Chemistry, Physical
subject category	Chemistry
unique article identifier	WOS:000538156300007