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Cambios en las propiedades catalíticas y adsorbentes de las nanopartículas Pt₃Mn de 2 nm por átomos de la superficie

Zhenwei Wu¹, Brandon C Bukowski¹, Zhe Li²

¹Davidson School of Chemical Engineering , Purdue University , West Lafayette 47907 , Indiana , United States.

Journal of the American Chemical Society

|October 24, 2018

Resumen

Las capas subterráneas impactan significativamente las nanopartículas soportadas (NPs) en la catálisis. Un subsuelo de platino-manganeso (Pt3Mn) mejora la selectividad de deshidrogenación del propano hasta el 98%, lo que demuestra una nueva dimensión de afinación para los catalizadores NP multimetales.

Área de la Ciencia:

Catálisis
Ciencias de los materiales
Nanotecnología

Sus antecedentes:

Las nanopartículas multimetales soportadas (NP) son cruciales en la catálisis industrial.
La influencia de las capas subterráneas en el rendimiento del catalizador NP es en gran medida inexplorada.

Objetivo del estudio:

Investigar el efecto de la composición del subsuelo sobre las PN del núcleo soportado.
Demostrar el papel de la formación intermetálica subterránea en la actividad catalítica y la selectividad.

Principales métodos:

Difracción de rayos X sincrotrón in situ
Espectroscopia de absorción de rayos X por diferencia
Espectroscopia de rayos X con dispersión de energía
Cálculos teóricos

Principales resultados:

Los NP de núcleo con un subsuelo Pt3Mn exhibieron una selectividad del 98% para la activación de enlaces C-H sobre C-C en la deshidrogenación de propano.
Los NP con un subsuelo Pt mostraron solo un 82% de selectividad en condiciones idénticas.
Se observaron calorías reducidas de adsorción del reactivo con el subsuelo Pt3Mn.

Conclusiones:

La composición del subsuelo influye críticamente en el rendimiento del catalizador NP soportado.
La formación intermetálica controlada, específicamente Pt3Mn bajo la superficie, mejora la selectividad catalítica.
Este enfoque de ingeniería subterránea ofrece una nueva estrategia para ajustar los catalizadores NP multimetales.

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