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Conversión directa de metano en metanol en las superficies de Ni-Ceria: Interacciones de soporte metálico y
Pablo G Lustemberg1, Robert M Palomino2, Ramón A Gutiérrez3
1Instituto de Fisica Rosario (IFIR), CONICET-UNR, , Bv. 27 de Febrero 210bis , S2000EZP Rosario , Santa Fe , Argentina.
Journal of the American Chemical Society
|May 29, 2018
Resumen
Las bajas cargas de níquel en el soporte de ceria permiten la conversión directa de metano en metanol a bajas temperaturas. La adición de agua mejora la selectividad al bloquear las vías de descomposición y facilitar la formación de metanol.
Área de la Ciencia:
- Catálisis
- Ciencias de los materiales
- Química del medio ambiente
Sus antecedentes:
- La conversión de metano en metanol es importante desde el punto de vista medioambiental, pero es un reto.
- Las superficies metálicas de níquel son ineficaces para la conversión directa de metano en metanol.
Objetivo del estudio:
- Investigar la conversión catalítica directa del metano en metanol utilizando cargas bajas de níquel en soporte de ceria.
- Aclarar el papel del agua en el ciclo catalítico y optimizar la selectividad.
Principales métodos:
- Estudio experimental mediante espectroscopia de fotoemisión de rayos X a presión ambiente.
- Estudio computacional que emplea cálculos de la teoría funcional de la densidad.
Principales resultados:
- Las cargas bajas de Ni sobre el CeO211 facilitan la generación directa de metanol a bajas temperaturas.
- La adición de agua mejora significativamente la selectividad del metanol al bloquear la descomposición del metilo.
- Las interacciones de soporte metálico son cruciales para activar el metano y el agua.
Conclusiones:
- El agua juega un doble papel: bloquea los sitios de descomposición y promueve la formación de metanol.
- El diseño de catalizadores de metal/óxido requiere considerar el papel del agua y las interacciones de soporte metálico para una conversión eficiente del metano.
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