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Nanohojas de metal orgánico deformables para reacciones catalíticas heterogéneas
Chuanhui Huang1,2, Zhihong Guo3,2, Xu Zheng3
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems Institute of Chemistry, Chinese Academy of Sciences, #2 Zhongguancun, North First Street, Beijing 100190, China.
Journal of the American Chemical Society
|April 18, 2020
Resumen
Las nanohojas de marco metálico-orgánico suave (MOF) mejoran la hidrogenación catalítica mediante la deformación, mejorando el transporte de masa a los nanocubos de paladio. Esta estrategia aumenta la eficiencia de adsorción y conversión de colorantes, ofreciendo información sobre la catálisis autopropulsada.
Área de la Ciencia:
- Ciencias de los materiales
- Ingeniería Química
- Catálisis
Sus antecedentes:
- La dinámica de la superficie del catalizador influye críticamente en las tasas de reacción.
- Las limitaciones de difusión molecular impiden el contacto reactivo-catalizador y reducen la eficiencia.
- La catálisis heterogénea suele sufrir limitaciones en el transporte de masas.
Objetivo del estudio:
- Desarrollar una estrategia para superar las limitaciones del transporte masivo en la catálisis heterogénea.
- Investigar el uso de nanohojas de marco metálico-orgánico suave (MOF) para mejorar el rendimiento catalítico.
- Comprender el papel de la deformabilidad del MOF en la facilitación del transporte de masas.
Principales métodos:
- Nanocubos de paladio (Pd) sintetizados encapsulados en nanohojas de MOF suaves.
- Reacciones de hidrogenación empleadas como sistema modelo.
- Utilizó simulaciones numéricas para analizar el transporte de masas y la eficiencia catalítica.
- Varió la relación longitud-espaciado de las nanohojas de MOF.
Principales resultados:
- Las nanohojas de MOF deformables mejoraron significativamente el transporte de masa a los nanocubos Pd.
- La adsorción del colorante aumentó 5 veces y la conversión catalítica 3 veces en comparación con los MOF no deformables.
- La eficiencia catalítica exhibió una tendencia de tipo volcánico, alcanzando un pico en una relación longitud-espaciado de 2: 1.
- La fuerza de corte del flujo de fluidos impulsa la deformación de MOF.
Conclusiones:
- Los soportes de MOF blandos se pueden diseñar para mejorar la actividad catalítica a través de un mejor transporte de masa.
- La deformabilidad de las nanohojas de MOF es clave para superar las limitaciones de difusión.
- Este trabajo proporciona una base para el diseño de catalizadores autopropulsados basados en el entendimiento mecanicista.
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