Zeolites can be effective catalysts for liquid-phase processing of carbohydrates for the production of chemicals and fuels, where high yields and selectivities are often attributed to confinement effects due to sorption in the micropores. However, solvent effect at the reactive solid-liquid phase is highly challenging to comprehend due to the co-presence of carbohydrate reactant, water, and co-solvents.<br/><br/>In this study, we evaluate the effect of co-solvent γ-valerolactone on glucose sorption by BEA and FAU zeolites using quantitative sorption measurements and calorimetry, in order to quantify and rationalize significant differences between the bulk liquid phase composition and the composition in the pore. Density functional theory modeling and magic angle spinning (MAS) NMR spectroscopy reveal the nature of the interactions between sorbed molecules and zeolites. The solvent effect is further illustrated under <i>operando</i> conditions with MAS-NMR for the NaX zeolite catalyzed isomerization of glucose to fructose.

Origin of the strong γ-valerolactone co-solvent effect on carbohydrate sorption and conversion by large-pore zeolites

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.