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Nanotrapa de enlace de hidrógeno basada en un marco metálico-orgánico para el almacenamiento y la separación

Yingxiang Ye¹, Shikai Xian^2,3, Hui Cui⁴

¹Department of Chemistry, University of North Texas, Denton, Texas 76201, United States.

Journal of the American Chemical Society

|December 29, 2021

Resumen

Una estrategia novedosa que utiliza nanotraps de enlace de hidrógeno en marcos orgánicos metálicos (MOF) permite una separación eficiente del dióxido de carbono (CO2) del acetileno (C2H2). MIL-160 MOF demuestra una adsorción y selectividad de acetileno superiores, estableciendo un nuevo punto de referencia para la separación de C2H2/CO2.

Área de la Ciencia:

Ciencias de los materiales
Ingeniería Química
Ciencia de la separación

Sus antecedentes:

La purificación del acetileno (C2H2) requiere una eliminación eficiente del dióxido de carbono (CO2), un desafío debido a propiedades moleculares similares.
Los métodos existentes luchan con la capacidad de adsorción-selectividad para la separación de C2H2/CO2.

Objetivo del estudio:

Desarrollar una nueva estrategia para mejorar la separación de C2H2/CO2 mediante el uso de marcos metálicos orgánicos (MOF).
Investigar el papel de los nanotraps de enlace de hidrógeno en la adsorción y separación selectiva de gases.

Principales métodos:

Síntesis y caracterización de tres MOF isostruturales (MIL-160, CAU-10H, CAU-23) con superficies de poros hechas a medida.
Experimentos de adsorción/desorción de gases en condiciones ambientales.
Experimentos innovadores, modelado computacional y espectroscopia FT-IR in situ para elucidar los mecanismos de adsorción.

Principales resultados:

MIL-160 tiene una capacidad de almacenamiento de C2H2 muy alta (191 cm3 g-1) y una absorción de CO2 significativamente menor (90 cm3 g-1).
MIL-160 demuestra un rendimiento superior de separación de C2H2/CO2, estableciendo nuevos puntos de referencia para el potencial de separación y la productividad de C2H2.
Las interacciones de enlace de hidrógeno huésped-huésped entre los nanotraps de MIL-160 y C2H2 se identifican como clave para la adsorción selectiva.

Conclusiones:

La regulación de los nanotraps de enlace de hidrógeno en las superficies de los poros de los MOF es una estrategia eficaz para desafiar la separación de C2H2/CO2.
MIL-160 representa un material muy prometedor para la purificación industrial del acetileno.
Este enfoque ofrece una nueva vía para superar las limitaciones en la separación selectiva de gases.

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