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Introducción de la complejación π en el marco aromático poroso para la adsorción altamente selectiva de etileno sobre

Baiyan Li¹, Yiming Zhang, Rajamani Krishna

¹Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States.

Journal of the American Chemical Society

|June 6, 2014

Resumen

Este estudio introduce la complejación π en los marcos aromáticos porosos (PAF) para mejorar la captura de etileno. El PAF-1-SO3Ag funcionalizado con Ag (I) exhibe una selectividad superior de etileno/etano, lo que permite la producción de etileno de alta pureza.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Ingeniería Química Ingeniería Química.
Ciencia de la adsorción Ciencia de la adsorción.

Sus antecedentes:

Las estructuras aromáticas porosas (PAF) son materiales avanzados con grandes superficies.
La separación eficiente del etileno del etano es crucial para la industria petroquímica.
Los materiales existentes a menudo carecen de la selectividad y la capacidad requeridas para esta separación.

Objetivo del estudio:

Introducir la complejación π en los FAP para mejorar la adsorción de etileno.
Desarrollar un adsorbente altamente selectivo para la separación de etileno/etano.
Para demostrar la aplicación práctica del material desarrollado en la purificación de etileno.

Principales métodos:

Funcionalización de PAF-1 con iones Ag (I) para crear PAF-1-SO3Ag.
Experimentos de adsorción utilizando isotermas de un solo componente y mezclas de gases.
Cálculos de la Teoría de la Solución Adsorbida Ideal (IAST) para la predicción de la selectividad.
Espectroscopia de infrarrojos in situ para confirmar la complejación π.
Experimentos de avance transitorios y simulaciones de procesos para la adsorción por oscilación de presión (PSA).

Principales resultados:

El PAF-1-SO3Ag demostró una selectividad de adsorción de etileno/etano excepcionalmente alta (Sads: 27 a 125).
La complejación π entre los iones etileno y Ag (I) se confirmó a través de entalpias de adsorción y espectroscopia IR in situ.
El material supera significativamente el rendimiento de las zeolitas y otras estructuras metal-orgánicas (MOF).
Las simulaciones mostraron la viabilidad de producir 99,95% + de etileno puro utilizando PSA con PAF-1-SO3Ag.

Conclusiones:

La introducción de la complejación π en los PAF es una estrategia viable para mejorar la absorción de etileno.
PAF-1-SO3Ag ofrece una solución prometedora para la separación selectiva de etileno/etano.
Este trabajo abre nuevas vías para el diseño de materiales porosos avanzados para separaciones de gases.

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