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Visualización de la interacción sinérgica dependiente de la distancia en la catálisis heterogénea de doble sitio

Shuaiwei Jiang¹, Jiawei Xue¹, Tong Liu^1,2

¹School of Nuclear Science and Technology, Key Laboratory of Precision and Intelligent Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, P.R. China.

Journal of the American Chemical Society

|October 11, 2024

Resumen

La optimización de la distancia de hidroxilo (OH) interfacial en catalizadores de doble sitio mejora la catálisis sinérgica. El espaciamiento preciso es clave para una desprotonación eficiente del reactivo y una alta actividad catalítica, como se muestra en la oxidación con ácido fórmico.

Área de la Ciencia:

La electroquímica
Catálisis
Ciencias de la superficie

Sus antecedentes:

Los grupos hidroxilo (OH) interfaciales son críticos para la catálisis sinérgica en las interfaces sólido/líquido.
Comprender la relación espacial entre el OH y los reactivos es un desafío, pero vital para la cinética de la reacción.

Objetivo del estudio:

Visualizar y cuantificar los efectos sinérgicos dependientes de la distancia del OH interfacial en la catálisis heterogénea de dos sitios.
Esclarecer el papel del OH en la desprotonación del reactivo en función de su proximidad a los sitios activos.

Principales métodos:

Se utilizó la nanospectroscopia infrarroja ex situ y la espectroscopia infrarroja in situ.
Se han investigado catalizadores de doble ubicación con distancias de pareja moduladas Inter-Rh (Ir-Co) e Inter-Ruthenium (Ir-Ru).

Principales resultados:

Se ha demostrado que el OH facilita la desprotonación, con una eficiencia dependiente de la distancia del sitio.
Se identificó una distancia óptima de Ir-Co de 7,9 Å para una sinergia de alta eficiencia, vinculada al equilibrio dinámico de OH.
Se observó una disminución de la sinergia a distancias subóptimas debido a la acumulación de OH.

Conclusiones:

Estableció una relación universal en forma de volcán entre la distancia espacial y la actividad catalítica (actividad de masa).
Destacó la importancia del equilibrio dinámico y la distancia espacial para la catálisis sinérgica, aplicable a varios metales oxófilos.

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