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Related Concept Videos

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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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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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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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
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Anionic Metal-Organic Framework Derived Cu Catalyst for Selective CO2 Electroreduction to Hydrocarbons.

Chun Fang Wen1, Shuang Yang1, Jing Jing He2

  • 1Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.

Small (Weinheim an Der Bergstrasse, Germany)
|August 2, 2024
PubMed
Summary

Anionic HKUST-1 derived copper catalysts (aHD-Cu) effectively convert CO2 into valuable C2 products via electrochemical reduction. This study exploits MOF restructuring for high-performance electrocatalysis, achieving significant ethylene yields.

Keywords:
CO2 electroreductionanionic metal–organic frameworkelectrochemical reconstructionethylene productlow‐coordination Cu site

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Metal-organic frameworks (MOFs) are promising for CO2 electroreduction (CO2RR).
  • MOF restructuring under reaction conditions is crucial for catalyst design.
  • Developing catalysts for multi-carbon (C2) product selectivity is essential.

Purpose of the Study:

  • To fabricate an anionic HKUST-1 (a-HKUST-1) as a pre-catalyst.
  • To investigate the electrochemical reduction of a-HKUST-1 into Cu-based catalysts.
  • To achieve high selectivity for C2 products in alkaline CO2RR.

Main Methods:

  • Facile solvent process for a-HKUST-1 synthesis.
  • Electrochemical CO2 reduction in an alkaline electrolyte.
  • In situ Raman spectroscopy for intermediate analysis.

Main Results:

  • The a-HKUST-1 catalyst reconstructs into an active Cu catalyst (aHD-Cu) under operating conditions.
  • aHD-Cu achieves a Faradaic efficiency (FE) for C2H4 of 56% and FE for C2 of ~80% at -150 mA cm-2.
  • The catalyst exhibits high electrochemically active surface area and low-coordinated sites.

Conclusions:

  • Exploiting MOF restructuring is key for designing efficient CO2RR catalysts.
  • The aHD-Cu catalyst demonstrates excellent performance for C2 product generation.
  • High *CO intermediate coverage on aHD-Cu favors hydrocarbon production.