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Catalysis02:50

Catalysis

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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.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
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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.
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.
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Catalizador molecular de ingeniería para la reacción de reducción de oxígeno

Chang Chen1,2, Yifan Li2,3, Aijian Huang1,4

  • 1Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing 100084, China.

Journal of the American Chemical Society
|September 20, 2023
PubMed
Resumen

Este estudio introduce un nuevo método libre de pirólisis para crear sitios diatómicos (DAS) en catalizadores de metal-nitrógeno-carbono, específicamente en heteroestructuras moleculares de FeCo (FeCo-MH). Estos FeCo-MH demuestran una actividad de reacción de reducción de oxígeno excepcional para pilas de combustible y baterías.

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Área de la Ciencia:

  • Ciencias de los materiales
  • La electroquímica
  • Catálisis

Sus antecedentes:

  • Los catalizadores de metal-nitrógeno-carbono (M-N-C) dispersos atómicamente con sitios diatómicos (DAS) mejoran la actividad y la estabilidad.
  • Los métodos convencionales de pirólisis para la síntesis de DAS carecen de control y identificación precisa.
  • Existen desafíos para distinguir los DAS verdaderos de las configuraciones falsas.

Objetivo del estudio:

  • Desarrollar una estrategia fiable y libre de pirólisis para la construcción de sitios diatómicos (DAS).
  • Sintetizar y caracterizar las "heteroestructuras moleculares" de FeCo (FeCo-MHs) como un nuevo catalizador de DAS.
  • Para aclarar la relación estructura-actividad de los FeCo-MH para las reacciones de reducción de oxígeno.

Principales métodos:

  • Se empleó una estrategia de adsorción específica en dos pasos, evitando la pirólisis a alta temperatura.
  • Se utilizó microscopía electrónica de transmisión por rotación in situ para la identificación precisa de cada uno de los FeCo-MH.
  • Se evaluó el rendimiento electroquímico para las reacciones de reducción de oxígeno (ORR).

Principales resultados:

  • Con éxito sintetizado FeCo-MHs con sitios diatómicos controlados.
  • Se confirmó la estructura de FeCo-MHs utilizando TEM de rotación in situ, descartando los falsos positivos.
  • Los FeCo-MH exhibieron momentos magnéticos modulados y una mayor proporción de fracciones Fe (II) -N4 de bajo espín.
  • Se ha logrado una actividad ORR excepcional con un potencial de media onda (E1/2) de 0,95 V.

Conclusiones:

  • La estrategia de adsorción específica sin pirólisis es eficaz para crear catalizadores DAS bien definidos.
  • Los FeCo-MH representan una clase prometedora de catalizadores para reacciones eficientes de reducción de oxígeno.
  • El catalizador desarrollado muestra potencial para cátodos de alto rendimiento en pilas de combustible y baterías de zinc-aire.