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Maximización del efecto sinérgico del catalizador de CoNi sobre el α-MoC para una producción robusta de hidrógeno

Yuzhen Ge¹, Xuetao Qin¹, Aowen Li²

¹Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, College of Engineering and BIC-ESAT, Peking University, Beijing 100871, China.

Journal of the American Chemical Society

|December 31, 2020

Resumen

Los catalizadores bimetálicos de cobalto-níquel (CoNi) altamente dispersos en carburo de molibdeno (α-MoC) muestran una producción superior de hidrógeno a partir de la hidrólisis del borano de amoníaco. Estos nuevos catalizadores superan incluso a los basados en platino.

Área de la Ciencia:

Ciencias de los materiales
Catálisis
Nanotecnología

Sus antecedentes:

El desarrollo de catalizadores eficientes y rentables para la producción de hidrógeno es crucial para la energía sostenible.
Los catalizadores de metales nobles como el platino son efectivos pero caros.
La hidrólisis del borano de amoníaco es una vía prometedora para la generación de hidrógeno.

Objetivo del estudio:

Para sintetizar catalizadores bimetálicos de CoNi muy dispersos en α-MoC.
Investigar el efecto de la interacción de soporte metálico fuerte (SMSI) en estos catalizadores.
Evaluar el rendimiento catalítico para la producción de hidrógeno a partir de la hidrólisis del amoniaco borano.

Principales métodos:

Síntesis de catalizadores bimetálicos de CoNi en el α-MoC.
Utilizando el efecto de interacción de soporte metálico fuerte (SMSI).
Caracterización a nivel atómico utilizando el mapeo químico en el espacio real.
Prueba de la actividad catalítica de la hidrólisis del amoniaco borano a 298 K.

Principales resultados:

Se obtiene CoNi altamente disperso en α-MoC con interacción a nivel atómico.
Se ha demostrado un rendimiento catalítico robusto y sinérgico.
El catalizador 1.5Co1.5Ni/α-MoC logró una actividad normalizada en metales de 321.1 mol_H2·mol^-1_CoNi·min^-1.
El rendimiento superó a los catalizadores sin metales nobles y fue cuatro veces mayor que el Pt/C comercial.

Conclusiones:

Los catalizadores CoNi/α-MoC muestran una excelente actividad y estabilidad para la producción de hidrógeno.
El efecto SMSI y las propiedades de α-MoC son clave para mejorar el rendimiento.
Estos catalizadores representan un avance significativo con respecto a las opciones existentes sin metales nobles.

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