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Catalizadores soportados por carburo de alta actividad para el desplazamiento de gas de agua
Neil M Schweitzer1, Joshua A Schaidle, Obiefune K Ezekoye
1Hydrogen Energy Technology Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA.
Journal of the American Chemical Society
|February 5, 2011
Resumen
Los catalizadores de platino (Pt) apoyados en carburo de molibdeno (Mo2C) muestran un rendimiento superior para la reacción de desplazamiento de gas de agua. Estos nuevos catalizadores exhiben una alta actividad y estructuras de partículas únicas, superando a los soportes de óxido tradicionales.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La catálisis por catálisis.
- Ingeniería Química Ingeniería Química.
Sus antecedentes:
- Los carburos nanoestructurados ofrecen grandes superficies como alternativas a los soportes de óxido en la catálisis heterogénea.
- Los carburos poseen actividad catalítica intrínseca, lo que permite ajustar el rendimiento del catalizador.
Objetivo del estudio:
- Para sintetizar el platino apoyado en catalizadores de carburo de molibdeno (Pt/Mo2C).
- Para evaluar su actividad catalítica para la reacción de desplazamiento de gas de agua (WGS).
Principales métodos:
- Síntesis de catalizadores Pt/Mo2C con interacción directa entre el precursor metálico y el soporte.
- Prueba de las velocidades de reacción de WGS en condiciones diferenciales.
- Utilizando métodos experimentales y computacionales para analizar sitios activos y morfología de partículas.
Principales resultados:
- Los catalizadores Pt/Mo2C demostraron tasas de WGS excepcionalmente altas, superando las de los catalizadores Pt soportados por óxido de última generación y un catalizador comercial.
- Se observaron morfologías atípicas de partículas de platino.
- Se identificaron sitios activos en el perímetro de las partículas Pt, con fuertes interacciones Pt-Mo2C.
Conclusiones:
- El carburo de molibdeno nanoestructurado es un material de soporte prometedor para catalizadores heterogéneos.
- Las fuertes interacciones entre metal y soporte conducen a estructuras de partículas únicas y una mayor actividad catalítica para la reacción WGS.
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