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Agua activada por oxígeno atómico en Au{11} para oxidar el CO a bajas temperaturas

Tae S Kim¹, Jinlong Gong, Rotimi A Ojifinni

¹University of Texas at Austin, Department of Chemical Engineering and Chemistry, Center for Nano- and Molecular Science and Technology, and Texas Materials Institute, 1 University Station C0400, Austin, Texas 78712-0231, USA.

Journal of the American Chemical Society

|May 11, 2006

Resumen

El agua juega un papel clave en la oxidación de monóxido de carbono (CO) a baja temperatura en las superficies de oro. Los experimentos muestran que el agua promueve activamente la oxidación del CO, incluso a 77 K.

Área de la Ciencia:

Ciencias de la superficie Ciencias de la superficie.
Catálisis Heterogénea.
La cinética química es la cinética química.

Sus antecedentes:

Las superficies de oro son catalizadores activos para las reacciones de oxidación.
La oxidación de CO a baja temperatura es crucial para varios procesos industriales.
Comprender el papel de los coadsorbatos como el agua es esencial para el diseño de catalizadores.

Objetivo del estudio:

Para investigar el papel del agua en la oxidación del monóxido de carbono (CO) en una superficie cubierta de oxígeno Au111) a bajas temperaturas.
Para dilucidar el mecanismo de reacción de la oxidación del CO promovida por el agua.

Principales métodos:

Utilizando etiquetado isotópico ([16O] y [H218O]) para rastrear las fuentes de oxígeno durante la reacción.
Realización de reacciones superficiales a temperaturas criogénicas (tan bajas como 77 K).
Impactar la superficie preparada con un haz de monóxido de carbono (CO) y analizar la formación del producto.

Principales resultados:

Se observó la formación de dióxido de carbono etiquetado individualmente ([C16O18O]) y etiquetado doblemente ([C16O16O]).
La presencia de agua etiquetada influyó significativamente en la distribución del producto.
La oxidación de CO se produjo de manera eficiente incluso a 77 K en presencia de agua.

Conclusiones:

El agua actúa como un promotor directo en la oxidación a baja temperatura de CO en Au cubierto de oxígeno111).
El estudio proporciona pruebas sólidas de la participación del agua en la facilitación de la oxidación del CO en estas condiciones.
Estos hallazgos tienen implicaciones para el diseño de sistemas catalíticos eficientes para la oxidación de CO a bajas temperaturas.

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