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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Pt catalizador atómico de una sola capa incrustado en cería enriquecida con defectos para una oxidación eficiente del

Shaohua Xie1, Liping Liu2, Yue Lu3

  • 1Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States.

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|November 2, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Los catalizadores de un solo átomo de platino con estructuras de coordinación controladas aumentan la oxidación de CO. Las capas atómicas de platino incrustadas en soportes de cería-alumina muestran una actividad y estabilidad superiores.

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Área de la Ciencia:

  • Catálisis
  • Ciencias de los materiales
  • Química de las superficies

Sus antecedentes:

  • La estructura de coordinación local de los sitios metálicos es crucial para el rendimiento del catalizador metálico soportado.
  • El control del entorno de coordinación de los catalizadores monoatómicos (SAC) es clave para optimizar su actividad.

Objetivo del estudio:

  • Fabricar estructuras de una sola capa atómica de platino (PtASL) con entornos de coordinación local controlados (incorporados frente a los adsorbidos) en soportes de cería y alumina.
  • Investigar el impacto de la coordinación local de Pt1 en la actividad catalítica y la evolución de la estructura durante la activación de la reducción.

Principales métodos:

  • Estrategia de enriquecimiento de defectos de superficie para la fabricación de estructuras PtASL.
  • Caracterización de la coordinación y dispersión local de Pt1.
  • Evaluación de la actividad catalítica para la oxidación de CO.

Principales resultados:

  • Se ha logrado una dispersión del 100% del metal con estructuras PtASL incrustadas y adsorbidas controladas con precisión.
  • El PtASL incrustado exhibió una frecuencia de rotación 3,5 veces mayor que el PtASL adsorbido para la oxidación de CO.
  • Las PtASL incrustadas mostraron una actividad 10-70 veces mayor en comparación con los átomos Pt individuales (Pt1).
  • La adsorción favorable de CO y la activación de oxígeno de celosía mejorada contribuyeron a una oxidación superior de CO sobre la Pt ASL incrustada.

Conclusiones:

  • El entorno de coordinación local de Pt1 influye significativamente en la actividad catalítica y la estabilidad estructural.
  • El PtASL incrustado en ceria-alumina ofrece una vía prometedora para catalizadores de alto rendimiento.
  • El control preciso de la coordinación del sitio del metal permite una eficiencia de utilización atómica del 100% y una actividad catalítica óptima.