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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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Introduction
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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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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a methylene group. The method was independently discovered by N. Kishner in 1911 and L. Wolff in 1912. The reduction is carried out in high-boiling solvents such as ethylene glycol and diethylene glycol because heat is required to deprotonate the N–H proton in one of the reaction steps.                                       ...
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Catalizador de Zn monoatómico estable y eficiente para la reducción de CO2 a CH4

Lili Han1,2, Shoujie Song1, Mingjie Liu3

  • 1Center for Electron Microscopy and Tianjin Key Lab of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.

Journal of the American Chemical Society
|June 16, 2020
PubMed
Resumen

Este estudio introduce un nuevo electrocatalizador que utiliza átomos de zinc individuales en carbono dopado con nitrógeno para la reducción electroquímica eficiente de dióxido de carbono (CO2) a metano (CH4). El catalizador demuestra una alta actividad, selectividad y estabilidad, superando a los materiales tradicionales a base de cobre.

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Área de la Ciencia:

  • La electroquímica
  • Ciencias de los materiales
  • Catálisis

Sus antecedentes:

  • La reducción electroquímica del dióxido de carbono (CO2) al metano (CH4) ofrece una solución energética sostenible.
  • El desarrollo de catalizadores altamente activos y duraderos es crucial para una conversión eficiente de CO2.
  • Los catalizadores existentes, en particular los basados en cobre, se enfrentan a limitaciones de selectividad y estabilidad.

Objetivo del estudio:

  • Diseñar e investigar un nuevo electrocatalizador para la reducción de CO2 a CH4 en medios acuosos.
  • Para lograr una alta eficiencia Faradaic, densidad de corriente parcial y estabilidad a largo plazo.
  • Para entender el mecanismo catalítico a nivel atómico.

Principales métodos:

  • Síntesis de átomos individuales de Zn apoyados en carbono microporoso dopado con N.
  • Caracterización electroquímica en una solución de 1 M KHCO3.
  • Cálculos teóricos (por ejemplo, DFT) para elucidar las vías de reacción.

Principales resultados:

  • El catalizador de un solo átomo de Zn logró una eficiencia Faradaic del 85% para la producción de CH4.
  • Se registró una densidad de corriente parcial de -31,8 mA cm-2 a -1,8 V frente a SCE.
  • El catalizador demostró una excelente estabilidad durante 35 horas de funcionamiento sin deterioro significativo del rendimiento.
  • Los cálculos teóricos indicaron que los átomos individuales de Zn suprimen la formación de CO y promueven la generación de CH4.

Conclusiones:

  • Los átomos individuales de Zn en el carbono N-dopado representan un catalizador muy eficaz para la electrorreducción de CO2 a CH4.
  • Este catalizador supera el rendimiento de los catalizadores convencionales basados en Cu para esta transformación.
  • Los hallazgos allanan el camino para los catalizadores avanzados en la utilización de CO2 y las tecnologías de energía sostenible.