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Desenterrar un precatalizador W/Ti bien definido y altamente activo anclado en una sola superficie de sílice para la

Manoja K Samantaray¹, Santosh Kavitake¹, Natalia Morlanés¹

¹King Abdullah University of Science and Technology, KAUST Catalysis Center (KCC) , Thuwal 23955-6900, Saudi Arabia.

Journal of the American Chemical Society

|February 11, 2017

Resumen

Un nuevo precatalizador bimetálico con tungsteno y titanio en sílice mejora significativamente la metástasis de propano. Esta cooperatividad entre metales logra una alta actividad, marcando un gran avance en la catálisis de la metátesis de alcanos.

Área de la Ciencia:

Química organometálica
Catálisis
Ciencias de los materiales

Sus antecedentes:

El desarrollo de catalizadores eficientes para la metástasis de alcanos es crucial para las transformaciones químicas.
Los complejos de tungsteno y titanio son catalizadores conocidos, pero a menudo requieren altas temperaturas.
Los sistemas bimetálicos bien definidos ofrecen un potencial para mejorar el rendimiento catalítico.

Objetivo del estudio:

Sintetizar y caracterizar un precatalizador bimetálico bien definido para la metástasis de propano.
Investigar el efecto cooperativo entre el tungsteno y el titanio en la catálisis.
Demostrar la eficacia del enfoque de la química organometálica superficial (SOMC) para el diseño de catalizadores.

Principales métodos:

Anclaje sucesivo de complejos organometálicos W ((Me) 6) y TiNp 4 en un soporte de sílice deshidroxilado.
Caracterización mediante técnicas avanzadas de química organometálica de superficie (SOMC), incluida la RMN múltiple 1H-1H.
Evaluación de la actividad catalítica en la metástasis de propano utilizando un reactor de flujo a 150 °C.

Principales resultados:

Se sintetizó con éxito un precatalizador bimetálico bien definido [Si-O-) W ((Me) 5 ((Si-O-) Ti ((Np) 3).
Los datos de RMN confirmaron la proximidad entre las especies de tungsteno y titanio.
El precatalizador bimetálico exhibió un volumen de negocios significativamente mayor (TON = 9784) en comparación con el catalizador monometálico de tungsteno (TON = 98).

Conclusiones:

La mayor actividad se atribuye a la cooperatividad entre el titanio y el tungsteno, con Ti probablemente involucrado en la activación de C-H y W en la metátesis de olefinas.
La proximidad de Ti a W es crítica para lograr un alto rendimiento catalítico en la metástasis de propano.
Este estudio presenta el primer informe de un sistema bimetálico bien definido preparado a través de SOMC que logra una alta actividad en la metástasis de propano a temperaturas moderadas.

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