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Síntesis de hidroxilamina a través de la electrorreducción de nitrato mediada por cetona

Shunhan Jia^1,2, Limin Wu^1,2, Xingxing Tan¹

¹Beijing National Laboratory for Molecular Sciences, CAS Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Center for Carbon Neutral Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

Journal of the American Chemical Society

|April 6, 2024

Resumen

Este estudio introduce un nuevo método de síntesis de hidroxilamina (NH2OH) a partir de nitrato mediado por cetonas. Este enfoque evita la reducción excesiva al amoníaco, logrando altos rendimientos y selectividad para una producción química más ecológica.

Área de la Ciencia:

La electroquímica
Catálisis
Química ecológica

Sus antecedentes:

La hidroxilamina (NH2OH) es un intermediario químico vital, pero su síntesis es un desafío debido a la sobrereducción.
La electrorreducción del nitrato ofrece una vía sostenible, sin embargo, la síntesis directa de NH2OH se ve obstaculizada por la formación de amoníaco.
La electrosíntesis eficiente y selectiva de NH2OH es crucial para diversas aplicaciones industriales.

Objetivo del estudio:

Desarrollar una nueva estrategia mediada por cetonas para la electrosíntesis de hidroxilamina (NH2OH) a partir de nitrato.
Investigar un catalizador de Cu derivado de un marco metálico-orgánico para esta reacción mediada por cetonas.
Optimizar la captura y liberación in situ de NH2OH mediante el uso de ciclopentanona (CP).

Principales métodos:

Reducción electrocatalítica del nitrato en presencia de ciclopentanona (CP) utilizando un catalizador a base de Cu.
Formación in situ del oximo de ciclopentanona (CP-O) para estabilizar la hidroxilamina.
Optimización de la hidrólisis CP-O para la liberación de NH2OH y la regeneración CP.
Caracterizaciones in situ, experimentos de control y cálculos teóricos para elucidar el mecanismo de reacción.

Principales resultados:

Se logró una excelente eficiencia Faradaic (47,8%) y una tasa de formación (34,9 mg h−1 cm−2) para CP-O.
Se ha demostrado una notable selectividad del carbono (> 99,9%) para el proceso mediado por cetonas.
La hidrólisis optimizada produjo una alta concentración de hidroxilamina estabilizada (96,1 mmol L-1).
Identificó la reconstrucción de la superficie del catalizador (coexistencia Cu0/Cu+) como clave para mejorar la producción de NH2OH.

Conclusiones:

La electrosíntesis mediada por cetonas es una estrategia viable y eficiente para la producción de hidroxilamina.
El catalizador de Cu desarrollado y el sistema de captura de CP mejoran significativamente el rendimiento y la selectividad del NH2OH.
La comprensión del mecanismo del catalizador proporciona información para el diseño de electrocatalizadores avanzados para la síntesis de NH2OH.

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