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El almacenamiento de hidrógeno en un marco metálico-orgánico microporoso con sitios de coordinación de Mn2+ expuestos

Mircea Dincă¹, Anne Dailly, Yun Liu

¹Department of Chemistry, University of California-Berkeley, Berkeley, CA 94720, USA.

Journal of the American Chemical Society

|December 21, 2006

Resumen

Un nuevo marco poroso metal-orgánico que utiliza el ligando 1,3,5-benzenetristetrazolato (BTT3-) exhibe una alta absorción de hidrógeno y densidad de almacenamiento. Este material muestra el mayor calor isostérico de adsorción para los MOF, crucial para el almacenamiento eficiente de hidrógeno.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Química Química es la química.
Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

Las estructuras metal-orgánicas (MOF) son prometedoras para las aplicaciones de almacenamiento de gases.
El desarrollo de MOF con una gran superficie y sitios de unión específicos es crucial para el almacenamiento eficiente de hidrógeno.

Objetivo del estudio:

Para sintetizar y caracterizar un nuevo marco poroso metal-orgánico utilizando un ligando puente tritópico.
Evaluar la capacidad de almacenamiento de hidrógeno y las propiedades de adsorción del nuevo MOF.

Principales métodos:

Síntesis de un nuevo MOF utilizando el ligando 1,3,5-benzenetristetrazolato (BTT3-).
Caracterización mediante difracción de rayos X y difracción de polvo de neutrones.
Mediciones de absorción de hidrógeno a temperaturas criogénicas y altas presiones.

Principales resultados:

Formación de un MOF poroso con una topología cúbica única: [Mn(DMF) [6]3[(Mn4Cl) 3(BTT) 8(H2O) [12]2.42DMF.11H2O.20CH3OH.
Alcanzó una absorción total de H2 de 6.9% en peso a 77 K y 90 bar, alcanzando el 85% de la densidad de almacenamiento de hidrógeno líquido.
Se observó un calor isostérico máximo de adsorción de 10.1 kJ/mol, el más alto para un MOF, vinculado a la unión de H2 en sitios Mn2+.

Conclusiones:

El MOF sintetizado demuestra excepcionales capacidades de almacenamiento de hidrógeno.
El alto calor de adsorción sugiere fuertes interacciones, beneficiosas para las aplicaciones prácticas de almacenamiento de hidrógeno.
La topología cúbica única y los sitios de unión contribuyen al rendimiento superior del material.

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