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

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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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Updated: May 13, 2026

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Óxido de cobalto mesoporoso ordenado como catalizador altamente eficiente de la evolución del oxígeno.

Jonathan Rosen1, Gregory S Hutchings, Feng Jiao

  • 1Center for Catalytic Science & Technology, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA.

Journal of the American Chemical Society
|March 2, 2013
PubMed
Resumen
Este resumen es generado por máquina.

El desarrollo de catalizadores abundantes en la tierra para el combustible solar es clave. Este estudio creó un catalizador de óxido de cobalto altamente poroso con una gran superficie, aumentando significativamente la actividad de evolución del oxígeno para una producción eficiente de combustible solar.

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Área de la Ciencia:

  • La catálisis es la catálisis.
  • Ciencia de los materiales Ciencia de los materiales.
  • Energía renovable Energía renovable.

Sus antecedentes:

  • Los catalizadores eficientes de la evolución del oxígeno son vitales para la producción de combustible solar.
  • Se buscan catalizadores basados en elementos abundantes en la Tierra para la producción en masa.

Objetivo del estudio:

  • Para fabricar un catalizador de óxido de cobalto mesoporoso con una superficie ultra alta.
  • Para mejorar la actividad de la evolución del oxígeno utilizando elementos abundantes en la tierra.

Principales métodos:

  • Sustitución de Mg en el espinel Co3O4 mesoporoso.
  • Lixiviación selectiva de Mg para crear porosidad y defectos.
  • Prueba de la evolución del oxígeno en sistemas de luz visible y químicos.

Principales resultados:

  • Se consigue una superficie ultra alta (hasta 250 m2/g).
  • Creó un óxido de cobalto altamente poroso con defectos de spinel.
  • Se ha demostrado una alta actividad de evolución del oxígeno, con un TOF de ~2.2 × 10−3 s−1 por átomo de Co en ácido.

Conclusiones:

  • El nuevo catalizador de óxido de cobalto mesoporoso supera significativamente el rendimiento de los tradicionales.
  • Este material muestra una gran promesa para la producción eficiente de combustible solar.
  • La ingeniería de defectos en óxidos porosos es una estrategia viable para la catálisis.