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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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The hydrogenation process takes place on the surface of...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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La actividad dependiente de la forma del catalizador de matriz de platino depende de su actividad.

Vladimir Komanicky1, Hakim Iddir, Kee-Chul Chang

  • 1Safarik University, Faculty of Sciences and, Institute of Experimental Physics, SAS, Kosice 04154, Slovakia. vladimir.komanicky@upjs.sk

Journal of the American Chemical Society
|April 8, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Hemos creado nanopartículas de platino catalizador en sustratos de titanato de estroncio. Sus disposiciones específicas de facetas impactan significativamente la actividad de la reacción de reducción de oxígeno, crucial para las pilas de combustible.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • La electroquímica es electroquímica.
  • La catálisis de la catálisis.

Sus antecedentes:

  • Las nanopartículas de platino son catalizadores vitales, especialmente para las reacciones de reducción de oxígeno en las células de combustible.
  • El control de la morfología de las nanopartículas y la interacción del sustrato es clave para mejorar el rendimiento catalítico.
  • Comprender la actividad específica de las facetas es crucial para diseñar catalizadores eficientes.

Objetivo del estudio:

  • Para producir y caracterizar matrices ordenadas de nanopartículas de platino catalizador con morfologías controladas.
  • Para correlacionar las características estructurales microscópicas con la actividad catalítica macroscópica.
  • Investigar el papel de diferentes facetas cristalográficas en la reacción de reducción de oxígeno.

Principales métodos:

  • Crecimiento epitaxial de nanopartículas de platino en sustratos de titanato de estroncio ((111), (100), (110)).
  • Utilizando litografía de haz de electrones para la fabricación precisa de matrices de nanopartículas.
  • Evaluación electroquímica de la actividad catalítica para la reacción de reducción de oxígeno.

Principales resultados:

  • Millones de nanopartículas de platino morfológicamente idénticas fueron producidas con éxito en matrices ordenadas.
  • La actividad catalítica varió con diferentes proporciones de facetas (111) y (100).
  • El aumento de la actividad sugiere un efecto cooperativo entre facetas con diferentes afinidades de oxígeno.

Conclusiones:

  • El área de superficie de (100) facetas es un factor crítico en el rendimiento del catalizador para la reducción de oxígeno.
  • La ingeniería de facetas de los catalizadores de platino ofrece un camino para mejorar la eficiencia de las pilas de combustible.
  • La interacción cooperativa entre diferentes facetas cristalinas mejora la reactividad catalítica.