Dehydration of xylose to furfural catalyzed by highly stable W-Nb-O mixed oxides Bronzes
[EN] In this work, the dehydration reaction of xylose (a representative C5 sugar) to furfural has been studied over W-Nb-O mixed oxides presenting hexagonal or pseudo-crystalline Bronze-type structure with controlled textural and acid properties, and also high stability under reaction conditions. Th...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/232819 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/232819 |
| Access Level: | acceso abierto |
| Palabra clave: | Xylose dehydration Furfural synthesis Acid catalyst Niobium doped tungsten oxides 09.- Desarrollar infraestructuras resilientes, promover la industrialización inclusiva y sostenible, y fomentar la innovación |
| Sumario: | [EN] In this work, the dehydration reaction of xylose (a representative C5 sugar) to furfural has been studied over W-Nb-O mixed oxides presenting hexagonal or pseudo-crystalline Bronze-type structure with controlled textural and acid properties, and also high stability under reaction conditions. Thus, a series of W-Nb-O metal oxides with different W/Nb ratios have been prepared hydrothermally, characterized by several physicochemical techniques and tested in autoclave-type reactors in liquid phase. Their influence on the catalytic activity has been assessed by tuning the Brønsted/Lewis acid properties of W-Nb-O materials. Interestingly, optimal catalytic results for the dehydration of xylose to furfural in monophasic system (water/ethanol mixture) were achieved for W0.20Nb0.80Ox catalyst, with a furfural selectivity comparable to that of sulfuric acid industrial catalyst. Furfural productivity (0.683 gFur ¿ gCat ¿ 1 ¿ h¿ 1) attained with this W-Nb-O catalyst was higher than that calculated for most relevant and recently reported solid acid catalysts working in both mono- and bi-phasic systems, respectively. Catalytic activity of W-Nb-O material remained practically unchanged after three consecutive reuses, while structure and chemical composition of material were maintained unaltered either after three catalytic cycles or after 14 days experiment carried out under optimal reaction conditions. Reactivity results have been explained on the combination of both Brønsted and Lewis acid sites as a result of the different incorporation of niobium into the bronze structure. |
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