Improved productivity in direct dimethyl ether synthesis and sorption enhanced DME synthesis using tungstosilicic acid as the acidic function
Renewable dimethyl ether (DME) can reduce the carbon footprint in LPG and transportation sectors. The direct synthesis of DME (DDMES) is attracting a great deal of attention because it is possible to increase the productivity of DME. However, DDMES is hindered by the formation of a high amount of wa...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/402727 |
| Acceso en línea: | http://hdl.handle.net/10261/402727 https://api.elsevier.com/content/abstract/scopus_id/105002413446 |
| Access Level: | acceso abierto |
| Palabra clave: | CO2-syngas Direct DME synthesis DME Heterpolyacids SEDMES |
| Sumario: | Renewable dimethyl ether (DME) can reduce the carbon footprint in LPG and transportation sectors. The direct synthesis of DME (DDMES) is attracting a great deal of attention because it is possible to increase the productivity of DME. However, DDMES is hindered by the formation of a high amount of water, which promotes the deactivation of both catalytic phases used in the DDMES, namely Cu/ZnO/Al2O3 and γ-Al2O3. This is particularly relevant when CO2-rich syngas is used, since it leads to a higher production of H2O. In this work we show that heteropolyacids such as HSiW are a suitable alternative to state-of-the-art γ-Al2O3 for the dehydration of methanol during the DDMES. This is because HSiW is not deactivated by the presence of water in the reaction medium. Thus, catalytic beds with HSiW reach up to four times higher DME productivity than those containing γ-Al2O3. This feature is further exacerbated when water is removed from the reactor by means of a sorbent, i.e., during the sorption enhanced direct DME synthesis (SEDMES). Thus, the total carbon conversion is higher for SEDMES than for DDMES regardless of the actual nature of the acid catalyst. |
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