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Los catalizadores Au soportados por carburo para reacciones de desplazamiento de agua-gas: un nuevo territorio para
Jinhu Dong1,2, Qiang Fu1, Zheng Jiang3
1State Key Laboratory of Catalysis, iChEM , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , China.
Journal of the American Chemical Society
|October 4, 2018
Resumen
Las nanopartículas de oro en el carburo de molibdeno exhiben una fuerte interacción de soporte metálico (SMSI), mejorando la actividad de la reacción de desplazamiento de agua-gas a baja temperatura (LT-WGSR). Este estado SMSI en catalizadores de metal/carburo es reversible, abriendo nuevas posibilidades catalíticas.
Área de la Ciencia:
- Catálisis heterogénea
- Ciencias de los materiales
- Química de las superficies
Sus antecedentes:
- La interacción fuerte de soporte metálico (SMSI) es crucial en la catálisis heterogénea, generalmente estudiada en sistemas de metal/óxido.
- El papel de SMSI en los catalizadores de metal/carburo sigue siendo en gran medida inexplorado.
- La comprensión de SMSI es clave para el diseño de materiales catalíticos avanzados.
Objetivo del estudio:
- Investigar la presencia y el impacto de SMSI en los catalizadores de carburo de oro/molibdeno (Au/MoC_x).
- Explorar la relación entre los estados electrónicos interfaciales y la actividad catalítica en los sistemas Au/MoC_x.
- Demostrar la adaptabilidad de SMSI en catalizadores de metal y carburo.
Principales métodos:
- Síntesis de los catalizadores Au/MoC_x.
- Caracterización de la estructura del catalizador, la dispersión y las propiedades electrónicas.
- Evaluación de la actividad catalítica en la reacción de desplazamiento agua-gas a baja temperatura (LT-WGSR).
- Estudios comparativos de los estados de catalizador carbonizado versus oxidado.
Principales resultados:
- Los catalizadores Au/MoC_x carbonizados exhibieron capas de oro altamente dispersas y una fuerte transferencia de carga interfacial, indicativa de un estado activo de SMSI.
- Estos catalizadores SMSI activos mostraron un excelente rendimiento LT-WGSR.
- El tratamiento de oxidación condujo a la agregación de nanopartículas de oro, debilitó la interacción electrónica y disminuyó la actividad LT-WGSR.
- Los estados de la interfaz del catalizador se cambiaron de forma reversible entre los estados SMSI activos y inactivos a través de ciclos de carbonización y oxidación.
Conclusiones:
- Este estudio demuestra un efecto activo de SMSI en catalizadores de carburo de oro/molibdeno, inducido por carbonización.
- Los hallazgos ponen de relieve el potencial de las interfaces metal/carburo para los fenómenos SMSI.
- La naturaleza reversible del estado SMSI ofrece nuevas vías para el diseño y el control de los procesos catalíticos.
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