Facile Synthesis of Reusable CoAl-Hydrotalcite Catalyst for Dehydration of Biomass-Derived Fructose into Platform Chemical 5-Hydroxymethylfurfural

摘要

A novel CoAl-hydrotalcite catalyst with different Co~(2+)/Al~(3+) ratios was facilely synthesized using a modified coprecipitation method Different techniques such as X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) were used to cliarac-terize the resultant CoAl-hydrotalcite. It was indicated that high crystallinity and a single-phase, layered structure with good composition was successfully fabricated. The resultant CoAl-hydrotalcite catalysts and two comparative hydrotalcites (ZnAl-HT and NiAl-HT) were employed for the selective dehydration of D-fructose into platform chemical5-hydroxymethylfurfural (HMF), which is a versatile intermediate for the production ofbiofuels and value-added chemicals. It was shown that the metal variation in Co~(2+)/Al~(3+) ratios and reaction temperature display clear influence on the catalytic activities. Furthermore, the spent CoAl-hydrotalcite catalysts were easily recycled and show high catalytic stability over three consecutive runs.