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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
Published on: July 18, 2017
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Catalizador de deshidrogenación de propano altamente productivo que utiliza nanopartículas Ga-Pt soportadas por
Keith Searles1, Ka Wing Chan1, Jorge Augusto Mendes Burak1
1ETH Zürich, Department of Chemistry and Applied Biosciences, Vladimir Prelog Weg 1-5 , ETH Zürich , CH-8093 Zurich , Switzerland.
Journal of the American Chemical Society
|August 28, 2018
Resumen
El desarrollo de nuevos catalizadores para la deshidrogenación de alcanos es crucial para la producción de olefinas a partir del gas de esquisto. Este estudio introduce un nuevo catalizador bimetálico de galio-platino (Ga-Pt) en sílice, que muestra un rendimiento superior en la deshidrogenación del propano.
Área de la Ciencia:
- Catálisis heterogénea
- Química organometálica de las superficies
- Ciencias de los materiales
Sus antecedentes:
- Los catalizadores eficientes de deshidrogenación de alcanos son esenciales para convertir el gas de esquisto en olefinas valiosas.
- Los catalizadores existentes a menudo enfrentan desafíos en la actividad, la selectividad y la estabilidad.
- La química organometálica de superficie ofrece una vía para diseñar materiales catalíticos avanzados.
Objetivo del estudio:
- Desarrollar un catalizador bimetálico nanométrico de galio-platino (Ga-Pt) muy eficaz para la deshidrogenación del propano.
- Investigar la relación estructura-actividad de los catalizadores Ga-Pt soportados en sílice parcialmente deshidroxilada con sitios de galio aislados.
Principales métodos:
- Preparación de nanopartículas bimetálicas Ga-Pt mediante el injerto secuencial de un precursor de platino en sílice que contiene galio.
- Caracterización del catalizador mediante espectroscopia de absorción de rayos X in situ para controlar la formación de especies reducidas (Gaδ+Pt0/SiO2).
- Evaluación del rendimiento catalítico en la deshidrogenación del propano.
Principales resultados:
- Formación de una estructura de aleación GaxPt (0.5 < x < 0.9) con una fracción de sitios de galio aislados.
- El catalizador bimetálico Ga-Pt demostró una actividad, selectividad y estabilidad significativamente mayores en comparación con los componentes individuales.
- El rendimiento mejorado se atribuye al efecto sinérgico de la aleación de GaxPt dispersa y la baja acidez de Brønsted del soporte.
Conclusiones:
- El catalizador bimetálico Ga-Pt desarrollado representa un avance significativo en la tecnología de deshidrogenación de alcanos.
- La nanoestructura y la composición únicas son clave para lograr un rendimiento catalítico superior.
- Este enfoque ofrece una vía prometedora para la utilización eficiente de hidrocarburos ligeros procedentes del gas de esquisto.
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