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Sitio molecular dinámico de matriz ortogonal de mezclas de propileno y propano
Heng Zeng1,2, Mo Xie1,2, Ting Wang1,2
1College of Chemistry and Materials Science, Jinan University, Guangzhou, P. R. China.
Nature
|July 22, 2021
Resumen
Los investigadores desarrollaron un nuevo material de marco metálico-orgánico (MOF), JNU-3a, que separa eficientemente el propileno del propano utilizando el tamiz dinámico molecular. Este material logra propileno de alta pureza en un solo ciclo, lo que ofrece un avance prometedor para las tecnologías de separación por adsorción.
Área de la Ciencia:
- Ciencias de los materiales
- Ingeniería Química
- Nanotecnología
Sus antecedentes:
- Los tamices moleculares rígidos se destacan por separar moléculas de diferentes tamaños.
- Los materiales de tamiz molecular dinámico pueden separar moléculas con propiedades similares.
- El diseño de marcos metálicos orgánicos flexibles (MOF) para el tamiz dinámico es un desafío.
Objetivo del estudio:
- Informar sobre un nuevo material MOF (JNU-3a) con bolsas moleculares incorporadas para el tamiz dinámico molecular.
- Para demostrar la capacidad del material para separar el propileno (C3H6) y el propano (C3H8).
- Investigar el mecanismo de separación y su potencial para separaciones adsorbentes.
Principales métodos:
- Síntesis y caracterización del material del MOF JNU-3a.
- Difracción de rayos X de un solo cristal para observar las transformaciones estructurales.
- Experimentos de ruptura de gas para evaluar el rendimiento de la separación.
Principales resultados:
- JNU-3a exhibe canales unidimensionales con bolsas moleculares dinámicas.
- Transformación de un solo cristal a otro observada tras la exposición al propileno o al propano.
- Propileno de alta pureza (≥99,5%) obtenido a partir de una mezcla equimolar en un ciclo.
- Se ha demostrado una productividad máxima de propileno de 53,5 L/kg.
- El mecanismo de tamizamiento molecular dinámico de matriz ortogonal permite una alta capacidad y cinética.
Conclusiones:
- JNU-3a es un material de tamiz de nueva generación para una separación adsorbente eficiente.
- La flexibilidad dinámica del material permite la separación selectiva del propileno del propano.
- Este diseño tiene potencial para aplicaciones industriales en separaciones de gases.
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