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Related Concept Videos

Catalysis02:50

Catalysis

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

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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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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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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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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

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3.6K
The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
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Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Amorphization Engineering Coupled with Anion Leaching Boosts Precatalyst Reconstruction for Enhanced Urea Oxidation.

Ping Li1, Han Yang1, Zhihong Jiang1

  • 1School of Environment Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-Sen University, Guangzhou, 510275, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|August 11, 2025
PubMed
Summary

Amorphous Mn-incorporated NiWO4 (a-MnNi-WO4) acts as a precatalyst for the urea oxidation reaction (UOR). This material self-reconstructs into an active catalyst, significantly enhancing UOR performance and outperforming other catalysts.

Keywords:
amorphization engineeringanion etchingprecatalystself‐reconstructionurea oxidation

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Nickel-based materials are promising precatalysts for the urea oxidation reaction (UOR).
  • Understanding the self-reconstruction of precatalysts and its link to electrocatalytic activity is crucial for designing advanced catalysts.
  • The inherent structure-related reconstruction behavior of Ni-based precatalysts for UOR remains poorly understood.

Purpose of the Study:

  • To construct and investigate amorphous Mn-incorporated NiWO4 (a-MnNi-WO4) as a precatalyst for expediting the UOR.
  • To elucidate the self-reconstruction mechanism of a-MnNi-WO4 during UOR.
  • To establish a material design principle for achieving fast and deep self-reconstruction in electrocatalytic systems.

Main Methods:

  • Synthesis of amorphous Mn-incorporated NiWO4 (a-MnNi-WO4) via rapid co-precipitation and mild heat treatment.
  • Electrochemical evaluation of the urea oxidation reaction (UOR) performance.
  • Analysis of the self-reconstruction process and the resulting catalyst structure and properties.

Main Results:

  • Amorphous phase engineering and leachable WO4^2- incorporation promote fast and complete self-reconstruction of a-MnNi-WO4 during UOR.
  • The reconstructed catalyst is porous, oxygen-vacancy-enriched, and low-crystalline Mn-doped NiOOH with an optimized electronic structure.
  • a-MnNi-WO4 exhibits superior UOR performance compared to crystalline counterparts and amorphous catalysts lacking Mn or WO4^2-.

Conclusions:

  • Amorphization engineering and sacrificial anion etching can be used to achieve fast and deep self-reconstruction of precatalysts.
  • The self-reconstruction ability of precatalysts is key to promoting the UOR.
  • The developed a-MnNi-WO4 precatalyst presents a state-of-the-art level for UOR, offering a new design principle for advanced electrocatalysts.