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La producción de cloruro de metilo a partir del metano sobre los catalizadores basados en lantano
Simon G Podkolzin1, Eric E Stangland, Mark E Jones
1The Dow Chemical Company, Core Research and Development, Midland, MI 48674, USA.
Journal of the American Chemical Society
|February 14, 2007
Resumen
Los catalizadores a base de lantano producen selectivamente cloruro de metilo a través de la oxidación del metano. El mecanismo implica reacciones superficiales y especies de oxígeno activado, que difieren de las vías tradicionales de cloración oxidativa.
Área de la Ciencia:
- La catálisis de la catálisis.
- Química de las superficies.
- Química Inorgánica La Química Inorgánica es la química inorgánica.
Sus antecedentes:
- La producción selectiva de cloruro de metilo es crucial para la síntesis química.
- Los mecanismos de cloración oxidativa existentes no se comprenden completamente.
- Los catalizadores basados en lantano ofrecen potencial para mejorar la selectividad.
Objetivo del estudio:
- Para dilucidar el mecanismo de producción de cloruro de metilo utilizando catalizadores basados en lantano.
- Para investigar los roles de metano, cloruro de hidrógeno y oxígeno en la reacción.
- Para comparar el mecanismo propuesto con las vías conocidas de cloración oxidativa.
Principales métodos:
- Actividad catalítica y mediciones espectroscópicas.
- Experimentos cinéticos y de flujo/pulso.
- Cálculos de la teoría de la densidad-funcional (DFT).
Principales resultados:
- Los catalizadores a base de lantano, incluidos el oxicloruro de lantano y el tricloruro de lantano, son activos y estables.
- La activación del metano ocurre en la superficie del catalizador a través de reacciones de oxidación-reducción.
- El oxígeno en fase gaseosa es esencial, activando el cloro superficial para formar especies activas de OCl.
- El papel del cloruro de hidrógeno se limita a mantener la cloración del catalizador.
Conclusiones:
- Se propone un nuevo mecanismo para la producción selectiva de cloruro de metilo, que implica la oxidación superficial del cloro.
- El mecanismo difiere significativamente de las vías de cloración oxidativa establecidas.
- Los catalizadores basados en lantano demuestran una alta actividad y estabilidad para esta transformación.
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