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Related Concept Videos

Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

3.4K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
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Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

2.4K
Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
2.4K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.2K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.2K
Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia

9.1K
Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
When dissolved in liquid ammonia, an alkali metal,...
9.1K
Electrodeposition01:08

Electrodeposition

597
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
597
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

5.6K
The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
5.6K

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Nitrate Electroreduction to Ammonia Over Copper-based Catalysts.

Tailei Hou1, Tianshang Shan1, Hongpan Rong1,2

  • 1Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, School of Chemistry and Chemical Engineering, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Chemsuschem
|December 16, 2024
PubMed
Summary
This summary is machine-generated.

Electrocatalytic nitrate reduction converts polluted nitrate to valuable ammonia. Copper-based catalysts show promise for this electrocatalytic nitrate reduction reaction (eNO3RR), but challenges remain in selectivity and stability.

Keywords:
Copper-based catalystsElectrocatalysisEnergy conversionNitrate reduction reaction

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Environmental Science

Background:

  • Electrocatalytic reduction of nitrate (NO3-) to ammonia (NH3) offers a sustainable route to valorize pollutants.
  • This process faces challenges including slow reaction kinetics and poor ammonia selectivity.

Purpose of the Study:

  • To provide a comprehensive review of electrocatalytic nitrate reduction reaction (eNO3RR) mechanisms.
  • To analyze the impact of catalyst structure on performance in eNO3RR.
  • To discuss current challenges and future prospects for Cu-based catalysts in eNO3RR.

Main Methods:

  • Review of existing literature on electrocatalytic nitrate reduction.
  • Analysis of reaction mechanisms and kinetics.
  • Investigation of structure-property relationships in monometallic and bimetallic Cu-based catalysts.

Main Results:

  • Cu-based catalysts exhibit fast kinetics for the nitrate reduction reaction, with a rapid NO3- to NO2- rate-determining step.
  • Non-noble metal catalysts, particularly copper, show potential for efficient electrocatalytic nitrate reduction.
  • Achieving high ammonia selectivity and catalyst robustness remains a key challenge for Cu-based systems.

Conclusions:

  • Cu-based catalysts are promising for electrocatalytic nitrate reduction to ammonia due to their kinetics.
  • Further research is needed to overcome selectivity and stability limitations for practical applications.
  • Understanding catalyst structure-performance relationships is crucial for designing advanced eNO3RR catalysts.