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Catálisis por oro soportado: correlación entre la actividad catalítica para la oxidación de CO y los estados de

Javier Guzman¹, Bruce C Gates

¹Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, USA.

Journal of the American Chemical Society

|March 5, 2004

Resumen

Este estudio muestra que el oro es clave para la catálisis de oxidación de CO en catalizadores de oro apoyados en MgO. El tamaño del clúster de oro no afectó la actividad, pero la presencia de oro se correlacionó con el rendimiento catalítico.

Área de la Ciencia:

La catálisis heterogénea.
Ciencias de la superficie Ciencias de la superficie.
Química de los materiales química de los materiales.

Sus antecedentes:

Los catalizadores de oro apoyados en MgO se investigan para la oxidación de CO.
Comprender los sitios activos en la catálisis del oro es crucial para desarrollar catalizadores eficientes.

Objetivo del estudio:

Para aclarar el papel de los estados de oxidación del oro y el tamaño del racimo en la actividad catalítica del oro apoyado en MgO para la oxidación del CO.
Para identificar las especies específicas de oro responsables de la actividad catalítica.

Principales métodos:

Espectroscopia de la estructura de absorción de rayos X cercana al borde (XANES) para determinar los estados de oxidación del oro.
Oxidación programada por temperatura (TPO) y reducción (TPR) para estudiar las reacciones superficiales del catalizador.
Espectroscopia de estructura fina de absorción de rayos X extendida (EXAFS) para analizar el tamaño del racimo de oro.

Principales resultados:

Se detectaron especies tanto de oro (I) como de oro (O) en los catalizadores de trabajo.
El tamaño del clúster de oro fue consistente en todas las muestras (aproximadamente 30 Å), no mostrando correlación con la actividad catalítica.
La actividad catalítica y la concentración de oro de superficie disminuyeron con el aumento de la presión parcial de CO, acompañada de un aumento de la formación de oro.

Conclusiones:

La actividad catalítica del oro apoyado en MgO para la oxidación de CO se atribuye principalmente a las especies de oro.
El tamaño del clúster de oro no es el factor determinante de la actividad en este sistema.
Los sitios catalíticos activos incorporan oro.

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