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Separaciones de etano/etileno en redes de coordinación diamondoides flexibles mediante un mecanismo de apertura de
Shao-Min Wang1, Mohana Shivanna2, Su-Tao Zheng1
1School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
Journal of the American Chemical Society
|February 1, 2024
Resumen
Las nuevas redes de coordinación flexibles separan selectivamente el etano del etileno. Estos materiales muestran una alta absorción de etano y permiten una purificación eficiente de etileno en un solo paso, lo que mejora los procesos de la industria química.
Área de la Ciencia:
- Ciencias de los materiales
- Ingeniería Química
- Ciencia de la separación
Sus antecedentes:
- La separación del etano (C2H6) y el etileno (C2H4) es crucial para la industria química, pero requiere mucha energía.
- Los métodos de separación existentes a menudo carecen de selectividad o eficiencia.
- Las redes de coordinación diamondoides ofrecen potencial para propiedades de adsorción de gas a medida.
Objetivo del estudio:
- Desarrollar nuevas redes de coordinación flexibles para la separación selectiva de etano y etileno.
- Investigar el mecanismo de apertura de la puerta en respuesta al etano y al etileno.
- Evaluar el rendimiento de estos materiales en aplicaciones de separación de gases.
Principales métodos:
- Síntesis de las redes de coordinación diamondoides flexibles (X-dia-1-Ni y X-dia-1-NiCo).
- Isotermas de adsorción de gases (N2, C2H6, C2H4) y difracción de rayos X in situ a presión variable.
- Modelado computacional para comprender las transformaciones estructurales.
- Experimentos de avance dinámico para la validación de la separación.
Principales resultados:
- El X-dia-1-NiCo exhibe una apertura selectiva de la puerta para el C2H6 pero no para el C2H4, con una alta proporción de absorción de C2H6/C2H4 de 9,1.
- Se observó una transformación estructural significativa de la fase de poros estrechos a la de poros grandes tras la adsorción de C2H6.
- Los estudios innovadores dinámicos lograron C2H4 de alta pureza (99,9%) en un solo paso.
Conclusiones:
- Las redes de coordinación diamondoides flexibles demuestran un rendimiento excepcional para la separación de C2H6/C2H4.
- El mecanismo de apertura de la puerta impulsado por C2H6 es clave para la selectividad observada.
- Estos materiales ofrecen una alternativa prometedora y energéticamente eficiente para la purificación industrial del etileno.
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