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Clusters de Au con capas atómicas en α-MoC como catalizadores para la reacción de desplazamiento agua-gas a baja

Siyu Yao¹, Xiao Zhang², Wu Zhou^3,4

¹College of Chemistry and Molecular Engineering and College of Engineering, Peking University, Beijing 100871, China.

Science (New York, N.Y.)

|June 24, 2017

Resumen

Los investigadores desarrollaron un nuevo catalizador para la reacción de desplazamiento de agua-gas (WGS). Este sistema produce eficientemente hidrógeno a temperaturas ultrabajas, mejorando la eficiencia energética de las operaciones químicas.

Área de la Ciencia:

Catálisis
Ciencias de los materiales
Ingeniería Química

Sus antecedentes:

La reacción de desplazamiento agua-gas (WGS) es crucial para la producción de hidrógeno y la eliminación de CO en aplicaciones energéticas.
El funcionamiento a baja temperatura es deseable para los catalizadores WGS, especialmente para la integración de pilas de combustible.
Los catalizadores existentes a menudo carecen de alta actividad, estabilidad o eficiencia energética a temperaturas ultrabajas.

Objetivo del estudio:

Desarrollar un catalizador altamente activo y estable para la reacción de desplazamiento agua-gas a temperatura ultrabaja.
Para crear un sistema de catalizador interfacial para la generación eficiente de hidrógeno.
Para cumplir los requisitos de temperatura de funcionamiento de las unidades de generación y consumo de hidrógeno instaladas en el lugar.

Principales métodos:

Síntesis de grupos de oro (Au) en capas en un sustrato de carburo de molibdeno (α-MoC).
Creación de un sistema catalizador de interfaz.
Investigación de la activación del agua y la adsorción del monóxido de carbono en la superficie del catalizador.

Principales resultados:

El catalizador Au/α-MoC demostró una alta actividad para la reacción WGS a temperaturas ultrabajas (303 K).
La activación del agua se produjo sobre el sustrato α-MoC.
El monóxido de carbono reaccionó con grupos hidroxilo superficiales en sitios adyacentes de Au, facilitando la reacción WGS.

Conclusiones:

El sistema de catalizador interfacial desarrollado permite una reacción de desplazamiento de agua-gas a temperatura ultrabaja eficiente.
Este avance ofrece potencial para la generación de hidrógeno con eficiencia energética en aplicaciones de celdas de combustible.
La interacción sinérgica entre los grupos Au y el sustrato α-MoC es clave para la alta actividad catalítica observada.

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