2026-09-15T13:35:58Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/95822024-10-03T00:05:15Zcom_10259_4244com_10259_5086com_10259_2604col_10259_4245

Illera Gigante, Alba Ester Candela Gil, Helena Bermejo-López, A. Barea Gómez, Pedro Alonso Riaño, Patricia Benito Román, Oscar Beltrán Calvo, Sagrario Sanz Díez, Mª Teresa 2024-10-02T08:18:55Z 2024-10-02T08:18:55Z 2024-08 0961-9534 http://hdl.handle.net/10259/9582 10.1016/j.biombioe.2024.107304 A green organic, solvent-free, subcritical water-CO2 (subW-CO2) system was proposed for the production of furfural from the main hemicellulose's sugar, xylose. Despite subW itself showed potential for furfural generation due to its catalytic properties under subcritical conditions; when CO2 was added into the system as pressurization agent, higher yields were reached due to its effect as a Brønsted acid when dissolved in water. Furthermore, its combination with different Lewis acidic catalysts showed a synergistic effect, further improving furfural yield. In a batch configuration, five homogeneous and four heterogeneous catalysts were tested at 180 °C and 5.5 MPa and compared for the first time in a subW-CO2 reaction medium. Different furfural production paths were determined for the two catalysts types, with higher xylose isomerization rates to xylulose when homogeneous trivalent metal catalysts were used. CrCl3 and Nafion NR50 resin were selected as best catalysts from each of the groups due to higher furfural production rates (51.9 ± 0.9 % yield/h) and higher furfural selectivity (60.9 %), respectively. Furthermore, Nafion NR50 catalytic activity remained unchanged after 10 runs at 180 °C. The green subW-CO2 system furfural yields were comparable to water-organic solvent biphasic ones, proving to be a promising green alternative. This work was supported by the Agencia Estatal de Investigación (AEI), Ministerio de Ciencia e Innovación (MICINN) and Next Generation UE (Plan de Recuperaciónn, Transformación y Resiliencia) [grant numbers TED2021-129311B–I00 and PDC2022-133443-I00 ] and the Junta de Castilla y León (JCyL) and the European Regional Development Fund (ERDF) [grant number BU050P20 ]. Benito-Román post-doctoral contract was funded by AEI through project PID2020–116716RJ-I00 . P. Barea predoctoral contract was funded by JCyL and the European Social Fund (ESF) by ORDEN EDU/ 1868/2022 , de 19 de diciembre. application/pdf eng Elsevier Biomass and Bioenergy. 2024, V. 187, 107304 https://doi.org/10.1016/j.biombioe.2024.107304 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica, Técnica y de Innovación 2021-2023/TED2021-129311B-I00/ES/Tecnologías verdes basadas en el empleo de fluidos presurizados para valorizar biomasa lignocelulósica mediante la producción de furfural/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica, Técnica y de Innovación 2021-2023/PDC2022-133443-I00/ES/Diseño de un prototipo para la extracción de bioproductos con agua subcrítica/ info:eu-repo/grantAgreement/Junta de Castilla y León//BU050P20//Valorización de la fracción proteica de subproductos de la industria agroalimentaria de Castilla y León mediante tecnologías de fluidos presurizados/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-116716RJ-I00/ES/TECNOLOGIAS DE FLUIDOS PRESURIZADOS PARA LA VALORIZACION DE SUBPRODUCTOS DE LA INDUSTRIA AGROALIMENTARIA: RECUPERACION DE PECTINA Y OTROS COMPUESTOS BIOACTIVOS DE ALTO VALOR/ Atribución-NoComercial 4.0 Internacional http://creativecommons.org/licenses/by-nc/4.0/ info:eu-repo/semantics/openAccess Catalysts Furfural Pressurized carbon dioxide Subcritical water Xylose Ingeniería química Chemical engineering Evaluation of homogeneous and heterogeneous catalytic strategies for furfural production from sugar-derived biomass in a solvent-free green pressurized reaction media (subcritical water-CO2) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Biomass and Bioenergy 187 107304