Comparative Selective Conversion of Biomass-Derived Mono- and Polysaccharides into Lactic Acid with Lanthanide Lewis Acid Catalysts
2024
Bermejo-López, A. | Illera Gigante, Alba Ester | Melgosa Gómez, Rodrigo | Beltrán Calvo, Sagrario | Sanz Díez, Mª Teresa
Lanthanides were tested (Ce3+, Er3+, and Yb3+) as catalysts to produce lactic acid (LA) from the monosaccharides present in corn stover (glucose, xylose, and arabinose) resulting in ytterbium being the most active. A MW-heated system led to similar LA yield as a conventionally heated pressurized system. The maximum value of LA yield was 40% at 240 °C after 20 min of isothermal treatment regardless the starting monosaccharides, which allowed to propose a similar LA production route based on the products profile determined along time for the three monosaccharides. Temperature and time determined the product profile, observing furfural degradation at severity factors higher than 3.5, while values higher than 5.5 were needed to observe LA degradation. By increasing temperature, catalyst solubility decreased, increasing its presence in the solid residue after treatment. Xylan conversion to LA was similar as for xylose, but lower yield was obtained from microcrystalline cellulose. Corn stover presented more amorphous regions leading to higher hydrolysis yields of its cellulose fraction.
Show more [+] Less [-]Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. This work was supported by the Agencia Estatal de Investigación (grant numbers TED2021-129311B-I00, PDC2022-133443-I00, and PID2022-136385OB-I00). A. Bermejo-López post-doctoral contract was funded by Margarita Salas grant (MARSA22/03). R. Melgosa contract was funded by a Beatriz Galindo Research Fellowship (BG20/00182).
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