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El alargamiento de la cadena de hidrocarburos en la hidrogenación catalítica de CO: evidencia de un mecanismo de

Julien Schweicher¹, Adam Bundhoo, Norbert Kruse

¹Chemical Physics of Materials (Catalysis-Tribology), Université libre de Bruxelles, Campus Plaine, CP 243, 1050 Brussels, Belgium.

Journal of the American Chemical Society

|September 21, 2012

Resumen

Este estudio cuantifica las especies de superficie durante la hidrogenación de CO sobre catalizadores de cobalto. Los resultados apoyan un mecanismo de inserción de CO y revelan la dependencia del crecimiento de la cadena en la presión de CO.

Área de la Ciencia:

La catálisis de la catálisis.
Ciencias de la superficie Ciencias de la superficie.
La cinética química es la cinética química.

Sus antecedentes:

Los catalizadores de cobalto son cruciales para la hidrogenación del CO.
Comprender los intermediarios de superficie es clave para optimizar las reacciones.
La cinética de transitorios químicos ofrece una poderosa herramienta para el análisis in situ.

Objetivo del estudio:

Para cuantificar las especies superficiales de carbono, oxígeno e hidrógeno durante la hidrogenación del CO.
Para dilucidar el mecanismo de reacción sobre los catalizadores del modelo Co/MgO (10/1).
Para investigar la relación entre las especies de superficie y la cinética de la reacción.

Principales métodos:

Utilizó cinética química transitoria con cambios rápidos en la composición del gas.
Monitoreo de las respuestas dependientes del tiempo de los reactivos y productos.
Especies adsorbidas cuantificadas y productos intermedios de reacción.

Principales resultados:

Las cantidades de especies superficiales excedieron una monocapa en condiciones de reacción.
Las respuestas de tiempo observadas se alinean con un mecanismo de inserción de CO.
La probabilidad de alargamiento de la cadena de Anderson-Schulz-Flory se correlacionó directamente con la presión de CO.

Conclusiones:

La hidrogenación de CO sobre Co/MgO (10/1) se produce a través de un mecanismo de inserción de CO.
La cobertura de la superficie y la presión de CO influyen en la probabilidad de crecimiento de la cadena.
El estudio proporciona información detallada sobre la química de la superficie de hidrogenación del CO.

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