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Un nuevo catalizador de nitruro de molibdeno con estructura romboédrica de MoS2 para aplicaciones de hidrogenación
Shanmin Wang1, Hui Ge2, Shouli Sun
1∥Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
Journal of the American Chemical Society
|March 24, 2015
Resumen
Los investigadores desarrollaron un nuevo catalizador de nitruro de molibdeno rico en nitrógeno, 3R-MoN2, utilizando un método de síntesis a alta presión. Este avanzado catalizador muestra un rendimiento superior en reacciones cruciales de energía limpia como la hidrodesulfurización y la metanización de gas de síntesis.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La catálisis de la catálisis.
- Energía renovable Energía renovable.
Sus antecedentes:
- Los nitritos de metales de transición ricos en nitrógeno son catalizadores prometedores para la energía limpia.
- La síntesis de estos materiales es un desafío debido a las limitaciones termodinámicas a presión atmosférica.
- Los nitritos de metales de transición existentes a menudo son deficientes en nitrógeno.
Objetivo del estudio:
- Desarrollar una ruta de síntesis a alta presión para el nitruro de molibdeno rico en nitrógeno.
- Caracterizar la estructura y las propiedades catalíticas del nitruro recién sintetizado.
- Evaluar su potencial para la producción de catalizadores a escala industrial.
Principales métodos:
- Reacción de intercambio iónico en estado sólido bajo alta presión (3,5 GPa).
- Síntesis de un nuevo nitruro de molibdeno, 3R-MoN2.
- Caracterización estructural (estructura romboédrica R3m, isotípica con MoS2).
- Pruebas catalíticas para la hidrodesulfurización y la metanación de gas de síntesis.
Principales resultados:
- Se ha sintetizado con éxito 3R-MoN2, rico en nitrógeno.
- 3R-MoN2 demostró una actividad tres veces mayor que la de MoS2 en la hidrodesulfurización del dibenzotiofeno.
- Logró más del doble de selectividad para la hidrogenación en comparación con MoS2.2.
- Exhibió una alta actividad catalítica en la metanación ácida (>80% de conversión de CO y H2 a 723 K).
Conclusiones:
- La ruta de alta presión permite la síntesis de 3R-MoN2.2, rico en nitrógeno.
- 3R-MoN2 es un catalizador altamente eficaz para la hidrodesulfurización y la metanización.
- El método de síntesis es factible para la producción de catalizadores a escala industrial, promoviendo tecnologías de energía limpia.
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