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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Mejora de la separación de etano y etileno dentro de las estructuras metálico-orgánicas isoreticulares
Rui-Biao Lin1, Hui Wu2, Libo Li1
1Department of Chemistry , University of Texas at San Antonio , One UTSA Circle , San Antonio , Texas 78249-0698 , United States.
Journal of the American Chemical Society
|September 15, 2018
Resumen
Desarrollamos un nuevo marco metal-orgánico (MOF) con estructuras de poros optimizadas que mejora significativamente la separación del etano del etileno. Este avance ofrece un método más eficiente para la producción de etileno de alta pureza en la industria petroquímica.
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 petroquímica, pero requiere mucha energía.
- Los métodos actuales de separación por adsorción que utilizan materiales porosos carecen de suficiente selectividad para una separación eficiente de C2H6/C2H4.
Objetivo del estudio:
- Desarrollar un adsorbente altamente selectivo para la separación eficiente de etano y etileno.
- Investigar el papel de la estructura de los poros y las propiedades de la superficie en la mejora de la selectividad del C2H6 frente al C2H4.
Principales métodos:
- Síntesis de dos estructuras metálico-orgánicas ultramicroporosas isoreticulares (MOF) con tamaños de poro controlados y superficies polares débiles.
- Caracterización mediante difracción de polvo de neutrones, isotermas de sorción de gas y análisis cristalográficos.
- Evaluación del rendimiento de separación a través de modelos moleculares y experimentos innovadores.
Principales resultados:
- Un análogo de MOF con poros más pequeños demostró una relación de absorción significativa de C2H6/C2H4 del 237% (60,0/25,3 cm3 cm-3), lo que indica una selectividad muy mejorada.
- La difracción de neutrones reveló un comportamiento de absorción auto adaptativo en el MOF, lo que permite contactos óptimos de van der Waals con C2H6.
- La estructura optimizada de los poros y la afinidad superficial se unen preferentemente a C2H6 sobre C2H4.
Conclusiones:
- El MOF ultramicroporo diseñado con estructura de poros adaptada es un adsorbente altamente eficiente para la separación de C2H6/C2H4.
- Este material ofrece una solución prometedora para la purificación energéticamente eficiente del etileno.
- El estudio pone de relieve la importancia de la ingeniería de poros en los MOF para la adsorción selectiva de gases.
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