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Related Concept Videos

Radical Oxidation of Allylic and Benzylic Alcohols01:21

Radical Oxidation of Allylic and Benzylic Alcohols

2.0K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
2.0K
Oxidation of Alcohols02:37

Oxidation of Alcohols

13.1K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
13.1K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

11.6K
Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
11.6K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.2K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.2K
Oxidations of Aldehydes and Ketones to Carboxylic Acids01:15

Oxidations of Aldehydes and Ketones to Carboxylic Acids

3.9K
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
3.9K

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Related Experiment Video

Updated: Jul 8, 2025

Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate
09:02

Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate

Published on: June 18, 2020

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Constructing α-MnO2/Mn2O3 heterojunction for formaldehyde oxidation.

Xuelin Huang1, Muhua Chen1, Guangyao Li1

  • 1School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, PR China.

Chemosphere
|December 17, 2023
PubMed
Summary
This summary is machine-generated.

We developed a novel manganese oxide heterojunction catalyst for efficient formaldehyde oxidation. This catalyst, featuring oxygen defects and phase interfaces, shows excellent performance in removing formaldehyde at low temperatures.

Keywords:
Formaldehyde oxidationHeterojunctionManganese oxide catalystMechanical millingPhase transformation

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Area of Science:

  • Materials Science
  • Catalysis
  • Environmental Chemistry

Background:

  • Developing efficient non-precious metal oxide catalysts for formaldehyde (HCHO) oxidation is crucial.
  • Constructing heterojunctions with oxygen defect-rich structures and abundant phase interfaces presents a significant challenge.

Purpose of the Study:

  • To present a simple and efficient method for fabricating highly active manganese oxide heterojunction catalysts for HCHO oxidation.
  • To investigate the catalytic performance and reaction mechanism of the synthesized heterojunction.

Main Methods:

  • Hydrothermal synthesis of α-MnO2/γ-MnOOH composite.
  • Mechanical milling to induce phase transformation and create α-MnO2/Mn2O3 heterojunction with oxygen defects.
  • In situ diffuse reflectance infrared Fourier transform spectroscopy and online gas chromatography for mechanistic studies.

Main Results:

  • The α-MnO2/Mn2O3 heterojunction catalyst demonstrated outstanding performance in HCHO oxidation.
  • Achieved 100% HCHO conversion at 80°C with a gas hourly space velocity of 120 L gcat−1 h−1.
  • Exhibited high mass-specific (8.92 μmol g−1 min−1) and area-specific (0.18 μmol m−2 min−1) reaction rates.

Conclusions:

  • The facile fabrication method yields a highly active α-MnO2/Mn2O3 heterojunction catalyst.
  • The catalyst's effectiveness is attributed to its oxygen defect-rich structure and abundant phase interfaces.
  • Mechanistic insights into HCHO oxidation were gained, highlighting the roles of component phases.