Sn-Al-USY for the valorization of glucose to methyl lactate: Switching from hydrolytic to retro-aldol activity by alkaline ion exchange
Lactic acid and ester derivatives, which are important precursors of a wide variety of products, can be prepared via retro-aldol sugar condensation in the presence of Sn-containing zeolites. However, the preparation of these materials is often complex and requires zeolitic structures that are diffic...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/377461 |
| Acceso en línea: | http://hdl.handle.net/10261/377461 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074394229&doi=10.1039%2fc9gc02609f&partnerID=40&md5=3f11d2eedffdfdaf745f6e09d4771e2d |
| Access Level: | acceso abierto |
| Sumario: | Lactic acid and ester derivatives, which are important precursors of a wide variety of products, can be prepared via retro-aldol sugar condensation in the presence of Sn-containing zeolites. However, the preparation of these materials is often complex and requires zeolitic structures that are difficult to obtain on a commercial scale, hindering the access to this technology at the industrial level. In the present study, a comparative investigation was conducted on the preparation of a faujasite zeolite functionalized with Sn and Al species from a commercial USY material using simple post-synthetic methods. The Sn-Al-USY zeolite displayed poor selectivity towards methyl lactate when the methanolic solutions of glucose were treated with it; however, alkaline ion-exchange switched the catalytic activity of this zeolite, enhancing its performance in retro-aldol condensation and inhibiting the dehydration pathway towards methyl levulinate. The catalytic activities of these materials have been correlated to their acid-base properties and the interaction of the supported tin species with alkali metals. Na and K-exchanged Sn-Al-USY demonstrated high catalytic activity in the transformation of glucose into methyl lactate, providing yields above 40% from glucose as well as good stability and reusability. © 2019 The Royal Society of Chemistry. |
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