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Formación electroquímica de enlaces C-N dentro de jaulas de imidazolato de boro con sitios únicos de cobre

Carter S Gerke¹, Yuting Xu², Yuwei Yang³

¹Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States.

Journal of the American Chemical Society

|December 6, 2023

Resumen

Los investigadores desarrollaron una nueva jaula de boro-imidazolato de cobre, BIF-29 ((Cu), para una síntesis eficiente de urea. Este electrocatalizador combina la reducción de dióxido de carbono con la reducción de nitratos, ofreciendo un método sostenible para la producción química.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Catálisis

Sus antecedentes:

La electrocatálisis permite la generación química bajo demanda utilizando energía renovable, mejorando la resiliencia de la red.
El desarrollo de catalizadores eficientes para reacciones complejas como el acoplamiento carbono-nitrógeno es crucial para la síntesis química sostenible.

Objetivo del estudio:

Investigar la viabilidad del uso de jaulas moleculares de imidazolato de boro (BIF-29 ((Cu)) para reacciones de electrorreducción acopladas.
Para lograr la producción selectiva de urea mediante la electrorreducción del dióxido de carbono (CO2RR) y la reducción de nitratos (NO3RR).

Principales métodos:

Utilizado BIF-29 como catalizador para el tándem CO2RR y NO3RR.
Se emplearon análisis electroquímicos, espectroscopia in situ y simulaciones a escala atómica para sondear los mecanismos de reacción.
Selectividad y actividad catalítica cuantificadas de la urea.

Principales resultados:

Se obtiene una alta selectividad de urea del 68,5% y una actividad de 424 μA cm-2.
Se ha demostrado que el BIF-29 ((Cu) facilita el acoplamiento C-N a través de sitios aislados de cobre monometálico.
Se ha identificado la vía de reacción clave que implica la condensación de *CO y NH2OH.

Conclusiones:

BIF-29 ((Cu) muestra una selectividad excepcional para la síntesis de urea a través de reacciones de electrorreducción acopladas.
Las jaulas metalorgánicas supramoleculares con sitios activos discretos son efectivas para transformaciones catalíticas complejas.
Este enfoque ofrece una vía prometedora para la producción sostenible de urea.

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