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Videos de Conceptos Relacionados

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...
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Catalysis02:50

Catalysis

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.
Catalysis01:27

Catalysis

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...
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Centros de hierro confinados en la interfaz para la oxidación catalítica.

Qiang Fu1, Wei-Xue Li, Yunxi Yao

  • 1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

Science (New York, N.Y.)
|May 29, 2010
PubMed
Resumen

Los investigadores estabilizaron los sitios de ferro insaturado coordinado (CUF) utilizando el confinamiento de la interfaz para la catálisis heterogénea. Estos sitios activan el dioxígeno y oxidan eficientemente el monóxido de carbono a bajas temperaturas, crucial para las pilas de combustible.

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Área de la Ciencia:

  • La catálisis heterogénea.
  • Ciencias de la superficie Ciencias de la superficie.
  • Química de los materiales química de los materiales.

Sus antecedentes:

  • Los sitios de hierro coordinadamente insaturado (CUF) son vitales para las reacciones catalíticas.
  • La creación de sitios activos análogos en catalizadores soportados es un desafío.
  • El confinamiento de la interfaz ofrece una nueva estrategia de estabilización.

Objetivo del estudio:

  • Para estabilizar los sitios de hierro insaturado coordinadamente (CUF) en matrices nanométricas para la catálisis heterogénea.
  • Investigar el papel del confinamiento de la interfaz en la estabilización de sitios activos.
  • Para evaluar el rendimiento catalítico de los sitios de CUF confinados en la interfaz.

Principales métodos:

  • Las mediciones de las ciencias de la superficie.
  • Cálculos funcionales de densidad.
  • Pruebas de actividad catalítica para la oxidación de CO.

Principales resultados:

  • El confinamiento de la interfaz estabiliza eficazmente los sitios de CUF a través de una fuerte adhesión entre los óxidos de hierro y los sustratos metálicos.
  • Los sitios de CUF confinados en la interfaz, con soportes metálicos, activan el dioxígeno, generando átomos reactivos de oxígeno.
  • El sistema demostró una alta eficiencia en la oxidación de monóxido de carbono a baja temperatura.

Conclusiones:

  • El confinamiento de interfaz es una estrategia viable para crear sitios de CUF estables y activos en catalizadores heterogéneos.
  • El sistema catalítico desarrollado es prometedor para aplicaciones en células de combustible de membrana de intercambio de protones.
  • Este trabajo avanza en la comprensión de la estabilización del sitio activo en catalizadores soportados.