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Updated: Nov 7, 2025

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Catalizador heterogéneo altamente activo para la dimerización de etileno preparado por dopaje selectivo de Ni en la

Cailing Chen¹, Mohammed R Alalouni¹, Xinglong Dong¹

¹Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.

Journal of the American Chemical Society

|April 28, 2021

Resumen

Un nuevo catalizador heterogéneo, Nickel-Zeolitic Imidazolate Framework-8 (Ni-ZIF-8), cataliza eficientemente la dimerización del etileno para producir 1-buteno. Este avance ofrece una alternativa estable y altamente activa a los catalizadores homogéneos tradicionales.

Área de la Ciencia:

Ciencias de los materiales
Catálisis
Ingeniería Química

Sus antecedentes:

La dimerización del etileno al 1-buteno es un proceso industrial clave.
Los catalizadores homogéneos son actualmente dominantes, pero se enfrentan a desafíos de estabilidad y separación.

Objetivo del estudio:

Desarrollar un catalizador heterogéneo altamente activo y estable para la dimerización del etileno.
Investigar el mecanismo catalítico y la relación estructura-actividad del nuevo catalizador.

Principales métodos:

Síntesis de un solo recipiente de catalizador heterogéneo Ni-ZIF-8.
Reacción de dimerización del etileno en condiciones variables (35 °C, 50 bar).
Etiquetado isotópico, caracterización y cálculos de la teoría funcional de la densidad (DFT).

Principales resultados:

El Ni-ZIF-8 demostró una actividad excepcional (frecuencia de rotación > 1,000,000 h−1) y una alta selectividad del 1-buteno (> 85%).
El catalizador mostró una estabilidad superior y una actividad constante durante 4 horas en comparación con los catalizadores homogéneos.
Los cálculos de DFT y el etiquetado isotópico confirmaron el mecanismo de Cossee-Arlman.

Conclusiones:

El Ni-ZIF-8 es un catalizador heterogéneo altamente activo, selectivo y estable para la dimerización del etileno.
El aislamiento y la coordinación únicos de Ni-site en ZIF-8 son responsables de su mejor rendimiento.
Este catalizador presenta una alternativa prometedora para la producción industrial de 1-buteno.

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