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

Preparation of Amines: Reduction of Oximes and Nitro Compounds

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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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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

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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.
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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A vacancy engineered MnO2- electrocatalyst promotes nitrate electroreduction to ammonia.

Guohui Wang1, Peng Shen1, Yaojing Luo1

  • 1School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China. chuk630@mail.lzjtu.cn.

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Researchers developed oxygen-vacancy-rich MnO2 nanosheets for efficient nitrate reduction reaction (NO3RR) to produce ammonia (NH3). This breakthrough offers a sustainable pathway for ammonia synthesis with high yield and stability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Nitrate reduction reaction (NO3RR) is a promising sustainable route for ammonia (NH3) production.
  • Developing high-performance electrocatalysts for NO3RR remains a significant challenge.

Purpose of the Study:

  • To construct oxygen vacancies (OVs) on MnO2 nanosheets to enhance their electrocatalytic activity for NO3RR.
  • To investigate the performance and stability of OV-rich MnO2 for NH3 synthesis.

Main Methods:

  • Synthesis of OV-rich MnO2 nanosheets.
  • Electrochemical evaluation of NO3RR performance, including ammonia yield and faradaic efficiency.
  • Density Functional Theory (DFT) calculations to elucidate the reaction mechanism.

Main Results:

  • OV-rich MnO2 nanosheets achieved a high NH3 yield of 3.34 mg h-1 cm-2 at -1.0 V vs. RHE.
  • An excellent faradaic efficiency (FE) of 92.4% for NH3 was obtained at -0.9 V vs. RHE.
  • The material demonstrated outstanding stability during the electrochemical process.

Conclusions:

  • Oxygen vacancies on MnO2 act as active sites, facilitating nitrate adsorption and dissociation.
  • OVs reduce hydrogenation energy barriers, promoting efficient NO3- to NH3 conversion.
  • OV-rich MnO2 is a highly promising electrocatalyst for sustainable ammonia production via NO3RR.