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Intentos para catalizar la conversión electroquímica de CO2 a metanol mediante moléculas de transferencia

Jean-Michel Saveant¹, Cédric Tard¹

¹Univ Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire , UMR 7591 CNRS, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France.

Journal of the American Chemical Society

|December 31, 2015

Resumen

Los investigadores investigaron la conversión electroquímica del dióxido de carbono (CO2) en metanol. Sus hallazgos indican que el catalizador previamente informado, la 6,7-dimetil-4-hidroxi-2-mercaptopteridina, no produce metanol ni formato en las condiciones probadas.

Área de la Ciencia:

Electroquímica y fotoquímica
Catálisis
Energía renovable y ciencias ambientales

Sus antecedentes:

La conversión electroquímica y fotoquímica del dióxido de carbono (CO2) en combustibles líquidos es fundamental para las soluciones energéticas y ambientales.
La producción de metanol a partir de CO2 es muy deseable, yendo más allá del monóxido de carbono (CO) y el formato.
Se exploran los donantes de hidruro biomimético para la reducción de CO2.

Objetivo del estudio:

Reevaluar la actividad catalítica reportada de la 6,7-dimetil-4-hidroxi-2-mercaptopteridina para la conversión electroquímica de CO2 en metanol y formato.
Para verificar los resultados de un estudio anterior (J. Es cierto. El químico. El fútbol. 2014, 136, 14007) mediante el uso de técnicas de análisis avanzadas.

Principales métodos:

Electrolisis en potenciales más negativos reportados.
Análisis mediante resonancia magnética nuclear de protones ((1) H NMR) con presaturación de H2O.
Cromatografía de gases (GC) con alta sensibilidad.
También se consideró la espectroscopia infrarroja (IR) y la resonancia magnética nuclear de carbono-13 ((13) C NMR).

Principales resultados:

La electrólisis no produjo metanol ni formato, como lo demuestran los análisis de (1) RMN y GC.
(1) La RMN H proporcionó resultados inequívocos, superiores a los de la RMN C y la espectroscopia IR para la detección de metanol y formato.
El GC confirmó la ausencia de formación de metanol.

Conclusiones:

No se pudieron justificar las afirmaciones sobre el efecto catalítico de la 6,7-dimetil-4-hidroxi-2-mercaptopteridina en la reducción electroquímica del CO2 a metanol y formato.
La reducción electroquímica directa o indirecta de la transferencia de hidrógeno de CO2 a formato y metanol sigue siendo una cuestión de investigación abierta.
La verificación rigurosa de los resultados experimentales es esencial en esta área de investigación de alto impacto.

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