Self-condensation of levulinic acid into bio-jet fuel precursors over acid zeolites: Elucidating the role of nature, strength and density of acid sites
The production of jet-fuel precursors from the aldol-dimerization of levulinic acid (LA) over acid zeolites is presented. Under solventless conditions, high LA conversion with selectivities to LA dimers > 90% are achieved. Chemisorption and spectroscopic analyses of the materials have revealed a...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/380377 |
| Acceso en línea: | http://hdl.handle.net/10261/380377 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85122254429&doi=10.1016%2fj.apcata.2022.118480&partnerID=40&md5=9344b782d9655ed930b9f4171ba0adce |
| Access Level: | acceso abierto |
| Palabra clave: | Acidity characterization Aldol condensation Beta zeolite Bio-jet fuel Levulinic acid |
| Sumario: | The production of jet-fuel precursors from the aldol-dimerization of levulinic acid (LA) over acid zeolites is presented. Under solventless conditions, high LA conversion with selectivities to LA dimers > 90% are achieved. Chemisorption and spectroscopic analyses of the materials have revealed a cooperative effect between strong Brønsted (BS) and strong Lewis (LS) acid sites, which favors the selective formation of dimers. BEA structure is the most efficient owing to shape selectivity effect. H-Beta 19, having an optimum Brønsted to Lewis acid sites ratio and the adequate balance of BS/LS acid sites, displayed the best catalytic performance in terms of activity and selectivity to LA dimers. Under optimized reaction conditions H-Beta 19 achieved 79% LA conversion and > 98% selectivity. An analysis on the stability showed good reusability in consecutive reaction cycles. The small loss of activity, ascribed to the formation of organic deposits, can be reverted by calcination in air. © 2022 Elsevier B.V. |
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