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Related Concept Videos

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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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.
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Introduction
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Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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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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Updated: May 15, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Enhanced Intermediates Inter-migration on Ag Single-Atom Alloys for Boosting Multicarbon Product Selectivity in CO2

Min Wang1,2, Minghui Fang1,2, Yingxuan Liu1,2

  • 1Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China.

Journal of the American Chemical Society
|May 2, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel silver-copper single-atom alloy cascade catalyst (AgCu-SAA) for electrochemical carbon dioxide reduction reaction (CO2RR). The catalyst significantly improves selectivity for multicarbon products by enhancing carbon monoxide intermediate utilization.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Electrochemical CO2 reduction reaction (CO2RR) is crucial for carbon cycle management and energy solutions.
  • Achieving high selectivity for multicarbon (C2+) products remains a significant challenge in CO2RR.
  • Efficient utilization of intermediates like carbon monoxide (CO) is key to improving CO2RR performance.

Purpose of the Study:

  • To develop a novel catalyst for enhanced selectivity in electrochemical CO2 reduction to C2+ products.
  • To investigate the mechanism of CO intermediate utilization in a cascade catalytic system.
  • To achieve high Faradaic efficiency for C2+ products at industrially relevant current densities.

Main Methods:

  • Fabrication of a silver-copper single-atom alloy cascade catalyst (AgCu-SAA) via an epoxide gelation approach.
  • Electrochemical characterization including cyclic voltammetry and chronoamperometry.
  • In situ Raman spectroscopy and density functional theory (DFT) calculations to elucidate reaction mechanisms.

Main Results:

  • The AgCu-SAA catalyst achieved a Faradaic efficiency (FE) of 83.4% for C2+ products at 900 mA cm-2.
  • High FE for C2+ products (74.8%) was maintained even at a high current density of 1100 mA cm-2.
  • In situ and DFT studies confirmed direct CO transfer from Ag single-atom sites to adjacent Cu sites, enhancing CO utilization.

Conclusions:

  • The AgCu-SAA catalyst effectively promotes CO2RR to C2+ products by facilitating an inter-migration pathway for CO intermediates.
  • This cascade catalytic approach significantly improves selectivity and efficiency, overcoming limitations of CO desorption.
  • The findings offer a promising strategy for designing advanced catalysts for efficient electrochemical CO2 conversion.