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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

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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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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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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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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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Preparation of Amines: Reduction of Amides and Nitriles01:13

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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.
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Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction01:09

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Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a methylene group. The method was independently discovered by N. Kishner in 1911 and L. Wolff in 1912. The reduction is carried out in high-boiling solvents such as ethylene glycol and diethylene glycol because heat is required to deprotonate the N–H proton in one of the reaction steps.                                       ...
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Updated: Jun 28, 2025

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Catalytic reduction of nitrogen monoxide using iron-nickel oxygen carriers derived from electroplating sludge: Novel

Xuchao Wang1, Chengyi Ding1, Hongming Long1

  • 1Anhui Province Key Laboratory of Metallurgy Engineering & Resources Recycling, Ma'anshan, Anhui 243002, China; School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243032, China.

The Science of the Total Environment
|April 9, 2024
PubMed
Summary

This study developed a novel catalyst from electroplating sludge for simultaneous CO and NO emission reduction, inspired by chemical looping combustion. The FeNi-OC catalyst effectively reduced emissions in both lab tests and iron ore sintering simulations.

Keywords:
CatalystElectroplating sludgeNiFe(2)O(4)Oxygen carriersResource utilization

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Area of Science:

  • Environmental Science
  • Catalysis
  • Materials Science

Background:

  • Electroplating sludge (ES) valorization offers economic and environmental advantages over traditional disposal methods.
  • Conventional emission control technologies often have limitations in efficiency and cost-effectiveness.

Purpose of the Study:

  • To develop a cost-effective denitrification method using electroplating sludge.
  • To prepare and characterize FeNi-OCs (iron-nickel-oxide-carbon structures) from ES for synergistic emission reduction.
  • To investigate the catalytic mechanism for simultaneous reduction of carbon monoxide (CO) and nitrogen monoxide (NO) emissions.

Main Methods:

  • Preparation of FeNi-OCs catalyst from electroplating sludge.
  • Analysis of catalyst phase structure, micromorphology, and valence states.
  • Experimental investigation of catalytic performance for CO and NO reduction at varying temperatures (350°C and 600°C).
  • Evaluation of catalyst effectiveness in simulated iron ore sintering flue gas.

Main Results:

  • FeNi-OCs demonstrated a chemical looping combustion (CLC)-like mechanism where CO reduced the catalyst, and NO re-oxidized it.
  • Simultaneous CO and NO consumption was observed, with near-complete NO conversion (100%) and significant CO conversion (21.41%) at 600°C.
  • Addition of 1.5% ES in iron ore sintering reduced CO and NO concentrations in flue gas by approximately 23% and 34%, respectively.

Conclusions:

  • FeNi-OCs derived from electroplating sludge offer a promising pathway for synergistic CO and NO emission reduction.
  • The CLC-inspired mechanism provides an efficient route for catalytic denitrification and emission control.
  • Valorization of electroplating sludge through catalyst preparation presents a sustainable solution for waste management and pollution control.