Speciation and kinetic study of iron promoted sugar conversion to 5-hydroxymethylfurfural (HMF) and levulinic acid (LA)
- Purdue Univ., West Lafayette, IN (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Direct Catalytic Conversion of Biomass to Biofuels (C3Bio)
- Purdue Univ., West Lafayette, IN (United States)
- Energy Frontier Research Centers (EFRC) (United States). Center for Direct Catalytic Conversion of Biomass to Biofuels (C3Bio); Purdue Univ., West Lafayette, IN (United States)
Cellulose, a major component of renewable biomass, is a polymer of glucose. Abundant and cheap iron salts promote the conversion of glucose to 5-hydroxymethylfurfural (HMF) and levulinic acid (LA). In this study, glucose transformations catalyzed by iron(III) chloride (FeCl3) in aqueous and in biphasic media (water and 2-methyltetrahydrofuran (MeTHF)) were investigated. Speciation via mass spectrometry (MS), UV-Vis, and X-ray absorption spectroscopy (XAS) show that FeIII is reduced to FeII (over 95%) readily in the early stage of carbohydrate conversion. The reaction time profiles of reactants (glucose and fructose) as well as products (HMF and LA) were modeled using MATLAB to obtain reaction rate constants. The contributions of iron and the intrinsic Brønsted acidity of iron salts in the sugar conversion are discussed. The kinetic study of sugar conversion indicated that the water–MeTHF biphasic system hinders the conversion of sugars to humins and unknown byproducts and increases the yields of HMF and LA. By adjusting concentrations of FeII and Brønsted acidity, yields of 88% LA (FeCl3, pH = 1) or 56% HMF (FeSO4, pH = 2) from glucose in a water–MeTHF biphasic system are achieved. In this work, the optimized reaction conditions proved effective in the conversion of milled poplar biomass to LA (53% yield based on glucose content) and furfural (64% yield based on xylan content) using iron salt, outperforming aluminum and chromium salts.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Direct Catalytic Conversion of Biomass to Biofuels (C3Bio)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0000997
- OSTI ID:
- 1386965
- Journal Information:
- Organic Chemistry Frontiers (Online), Vol. 2, Issue 10; Related Information: C3Bio partners with Purdue University (lead); Argonne National Laboratory; National Renewable Energy Laboratory; Northeastern University; University of Tennessee; ISSN 2052-4129
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
SnCl4-catalyzed isomerization/dehydration of xylose and glucose to furanics in water
Method to convert biomass to 5-(hydroxymethyl)-furfural (HMF) and furfural using lactones, furans, and pyrans as solvents