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Cobalt monoatómico tricoordinado en zeolita que aumenta la deshidrogenación del propano

Ziqiang Qu¹, Guangyuan He², Tianjun Zhang³

¹Innovation Center for Chemical Science, College of Chemistry, Chemical Engineering and Materials Science, Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215123, P. R. China.

Journal of the American Chemical Society

|March 25, 2024

Resumen

Los investigadores desarrollaron un nuevo catalizador para la deshidrogenación del propano, logrando altas tasas de producción de propileno y selectividad. Este catalizador de metal no noble y rentable ofrece una alternativa prometedora a las costosas opciones basadas en platino.

Área de la Ciencia:

Catálisis
Ciencias de los materiales
Ingeniería Química

Sus antecedentes:

La deshidrogenación del propano (PDH) es una vía clave para la producción de propileno.
Los catalizadores actuales de PDH a menudo usan platino caro o cromo tóxico.
El desarrollo de catalizadores rentables y respetuosos con el medio ambiente es crucial.

Objetivo del estudio:

Descubrir un nuevo catalizador eficiente y sostenible para el PDH.
Identificar nuevos sitios activos para mejorar el rendimiento catalítico.
Para explorar alternativas de metales no nobles para la síntesis de propileno.

Principales métodos:

Síntesis de la zeolita de silicalita-1 dopada con molibdeno.
Caracterización de los sitios activos del catalizador mediante técnicas avanzadas.
Evaluación del rendimiento del catalizador en la deshidrogenación del propano.
Cálculos de la teoría funcional de la densidad (DFT) para aclarar los mecanismos de reacción.

Principales resultados:

Descubrimiento de una unidad de cobalto tricoordinado insaturado como el centro activo.
Se obtiene una tasa de formación de propileno de 22,6 molC3H6 Coo-1 h-1 con una selectividad > 99% a 550 °C.
El rendimiento del catalizador superó el de los catalizadores basados en Co y algunos basados en Pt.

Conclusiones:

La unidad de cobalto tricoordinado insaturado mejora significativamente la actividad y la selectividad del PDH.
Este catalizador representa un avance en el desarrollo de catalizadores de metales no nobles de bajo costo para el PDH industrial.
Los hallazgos abren nuevas vías para la producción sostenible de propileno.

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