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Espectroscopia infrarroja sobre la activación y conversión de enlaces C-H de metano en el platino

Jia-Feng Du¹, Jin-Yu Ye¹, Chao Yang¹

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China.

Journal of the American Chemical Society

|December 2, 2025

Resumen

La comprensión de los mecanismos de electrooxidación del metano (CH4) es clave para la síntesis sostenible de C1. Este estudio revela la activación de CH4 en Pt/C a través de la espectroscopia operando y DFT, identificando los intermediarios *CH y sus vías de oxidación dependientes del potencial.

Área de la Ciencia:

La electroquímica
Catálisis
Ciencias de la superficie

Sus antecedentes:

La síntesis química sostenible del C1 se basa en la electrooxidación eficiente del metano.
La elucidación de los mecanismos de reacción es crucial para diseñar catalizadores eficaces.
Los catalizadores basados en platino son prometedores para la conversión de metano.

Objetivo del estudio:

Investigar exhaustivamente las vías mecanicistas de la electrooxidación del metano en conjuntos de electrodos de membrana Pt/C (MEAs).
Identificar los productos intermedios clave y comprender su formación y transformación durante la reacción.
Proporcionar una base mecánica para el diseño de catalizadores de electrooxidación selectiva de metano.

Principales métodos:

Se utilizó una espectroscopia infrarroja *operando* de alta sensibilidad para controlar los intermedios de la reacción.
Empleó cálculos de la teoría funcional de la densidad (DFT) para validar los hallazgos experimentales y explorar la energética.
Se ha investigado la electrooxidación del metano a través de una amplia ventana de potencial (-0,4 a 0,3 V frente a RHE).

Principales resultados:

Se detectó una banda característica a ~ 2916 cm, asignada a los intermedios CH formados a través de la deshidrogenación del metano.
Encontró que la activación de metano es termodinámicamente favorable y casi independiente del potencial.
Se ha demostrado que los pasos de oxidación posteriores (*CH a *CO, *COOH, CO₂) dependen del potencial y están influenciados por la adsorción *OH y la cobertura superficial.

Conclusiones:

Se ha proporcionado evidencia espectroscópica directa de la activación del metano en las superficies de Pt.
Destacó el papel crítico de la estabilización intermedia de *CH y la oxidación selectiva para el diseño del catalizador.
Estableció un entendimiento mecanicista para guiar el diseño racional de catalizadores para la electrooxidación selectiva del metano.

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