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Conversión de gas de síntesis en etanol mediante un catalizador de aleación de RhFe

Wei Zhou¹, Scott R Docherty¹, Erwin Lam²

¹Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zurich, Switzerland.

Journal of the American Chemical Society

|April 7, 2025

Resumen

Los catalizadores de rodio promovidos por el hierro convierten eficientemente el gas de síntesis en etanol. Los catalizadores modelo RhFe@SiO2 bien definidos demuestran una alta selectividad del etanol, a diferencia de los catalizadores no promovidos que producen metano.

Área de la Ciencia:

Catálisis
Ciencias de los materiales
Química sustentable

Sus antecedentes:

La conversión directa de gas de síntesis en etanol es una vía clave de producción química sostenible.
Comprender las relaciones estructura-actividad del catalizador Rh-Fe es crucial pero desafiante debido a su complejidad.

Objetivo del estudio:

Construir catalizadores modelo RhFe@SiO2 bien definidos para la conversión de gas de síntesis en etanol.
Para aclarar la estructura y la función de las interacciones Rh-Fe en condiciones de reacción.

Principales métodos:

Síntesis de catalizadores modelo RhFe@SiO2 utilizando la química organometálica de la superficie.
Espectroscopía de absorción de rayos X in situ (XAS) y espectroscopía de transformación de Fourier en infrarrojo de reflexión difusa (DRIFTS).

Principales resultados:

El catalizador RhFe@SiO2 logró una selectividad del 38% para el etanol con una conversión de CO del 8,4%.
El Rh@SiO2 no promovido produce principalmente metano (>90% de selectividad).
En los estudios in situ se identificó una aleación de Rh-Fe estable (aprox. 3:1 Rh/Fe) con sitios de Fe (II) residuales.

Conclusiones:

Los catalizadores modelo RhFe@SiO2 bien definidos permiten una conversión eficiente y selectiva del gas de síntesis al etanol.
La estructura de la aleación Rh-Fe es clave para la alta selectividad del etanol.
La química organometálica de superficie proporciona una visión de los sistemas catalíticos complejos.

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