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ZnO-Au modificado por Pd que permite la formación de intermediarios alcoxínicos y la deshidrogenación para la

Wenbin Jiang^1,2, Jingxiang Low¹, Keke Mao³

¹Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), School of Chemistry and Materials Science, and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China.

Journal of the American Chemical Society

|December 29, 2020

Resumen

Este estudio introduce un nuevo método fotocatalítico para convertir el metano directamente en etileno utilizando un catalizador ZnO-Au modificado por Pd. Este enfoque mejora la selectividad para la producción de etileno valioso en condiciones suaves.

Área de la Ciencia:

Catálisis
Ciencias de los materiales
Ingeniería Química

Sus antecedentes:

La conversión del metano en compuestos multicarbónicos es crucial para la producción de materias primas químicas.
Los métodos fotocatalíticos actuales producen una selectividad limitada hacia el etileno, un producto de alto valor.
Los radicales de metilo dominan los intermedios, favoreciendo el etano sobre el etileno.

Objetivo del estudio:

Desarrollar una vía fotocatalítica directa para la conversión de metano en etileno.
Investigar el papel de los compuestos alcoxiintermedios en esta conversión.
Mejorar la selectividad para la producción de etileno a partir del metano.

Principales métodos:

Se utilizó un catalizador híbrido ZnO-Au modificado por Pd para la fotocatálisis.
Se emplean caracterizaciones in situ para comprender los mecanismos de reacción.
Se analizó la conversión de metano y la selectividad del producto C2+.

Principales resultados:

Se ha logrado una vía de conversión fotocatalítica directa de metano a etileno.
Se ha identificado la formación y la deshidrogenación de intermedios methoxy y ethoxy.
El catalizador optimizado produjo una conversión de 536,0 μmol g-1 de metano con un 96,0% de selectividad de C2+ (39,7% de etileno).

Conclusiones:

La deshidrogenación inducida por Pd es clave para la nueva vía.
Los intermediarios methoxy y ethoxy facilitan la formación de etileno.
Este trabajo ofrece información sobre la conversión leve de metano y la selectividad de hidrocarburos insaturados.

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