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Catalizadores de deshidrogenación de propano y oxidación superficial en tándem para la síntesis selectiva de

Wei Wang^1,2,3, Sai Chen^1,3, Chunlei Pei^1,3

¹Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.

Science (New York, N.Y.)

|July 27, 2023

Resumen

Este estudio introduce un nuevo enfoque catalítico para la producción de propileno a través de la deshidrogenación del propano (PDH). Al acoplar el bucle químico con la combustión selectiva de hidrógeno, el método supera las limitaciones termodinámicas, logrando una alta selectividad y conversión.

Área de la Ciencia:

Ingeniería Química
Catálisis
Ciencias de los materiales

Sus antecedentes:

La deshidrogenación directa del propano (PDH) al propileno es comercialmente importante, pero está limitada por la termodinámica y la naturaleza endotérmica.
Los métodos existentes para la eliminación de hidrógeno se enfrentan a problemas de seguridad y costo.

Objetivo del estudio:

Desarrollar un nuevo sistema catalítico para el PDH eficiente mediante su acoplamiento con la combustión selectiva de hidrógeno.
Investigar un catalizador redox multifuncional de vanadato férrico y óxido de vanadio (FeVO4-VOx) para este proceso.

Principales métodos:

Se utilizó un catalizador redox FeVO4-VOx apoyado en Al2O3 para la combustión acoplada de PDH e hidrógeno.
Se emplearon experimentos catalíticos, caracterización espectroscópica y cálculos teóricos para dilucidar el mecanismo.
Se realizaron 200 ciclos de enlace químico para evaluar la estabilidad y el rendimiento del catalizador.

Principales resultados:

Se obtiene una selectividad del propileno del 81,3% a una conversión del propano del 42,7% a 550°C.
Se ha demostrado la estabilidad del catalizador durante 200 ciclos químicos.
Propuso un mecanismo de acoplamiento mediado por derrame de hidrógeno.

Conclusiones:

La proximidad de los sitios de deshidrogenación (VOx) y combustión (FeVO4) es crucial para el mecanismo propuesto.
El derrame de hidrógeno a sitios adyacentes de FeVO4 facilita la eliminación eficiente del hidrógeno, desplazando el equilibrio de PDH hacia la producción de propileno.

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