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Related Concept Videos

Radical Oxidation of Allylic and Benzylic Alcohols01:21

Radical Oxidation of Allylic and Benzylic Alcohols

2.7K
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...
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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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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.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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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.
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Oxidation of Alcohols02:37

Oxidation of Alcohols

15.4K
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:
15.4K
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Catalysis02:50

Catalysis

29.9K
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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Related Experiment Video

Updated: Dec 29, 2025

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

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Amorphous manganese oxide as highly active catalyst for soot oxidation.

Yibo Gao1, Zhongpeng Wang2, Chenchen Cui1

  • 1School of Water Conservancy and Environment, University of Jinan, 336 Nanxinzhuang West Road, Jinan, 250022, People's Republic of China.

Environmental Science and Pollution Research International
|February 7, 2020
PubMed
Summary

Highly active amorphous manganese oxide catalysts synthesized via colloidal solution combustion synthesis show superior soot combustion performance. Amorphous structures with hierarchical porosity exhibit enhanced low-temperature reducibility and active oxygen species for efficient oxidation.

Keywords:
Amorphous and crystal MnOxCatalytic activityMesoporousSoot oxidation

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Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
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Area of Science:

  • Materials Science
  • Catalysis
  • Environmental Engineering

Background:

  • Soot combustion is crucial for reducing diesel engine emissions.
  • Developing efficient catalysts for soot oxidation is an ongoing challenge.
  • Manganese oxides (MnOx) are promising catalysts, but their structural effects on activity require further investigation.

Purpose of the Study:

  • To synthesize and characterize amorphous and crystalline manganese oxide catalysts for soot combustion.
  • To compare the catalytic activity of amorphous and crystalline MnOx.
  • To elucidate the structure-activity relationships governing soot oxidation.

Main Methods:

  • Colloidal solution combustion synthesis (CSCS) for catalyst preparation.
  • Characterization using X-ray diffraction, N2 adsorption-desorption, temperature-programmed reduction, SEM, and XPS.
  • Soot oxidation activity evaluation, using T10 as an indicator.

Main Results:

  • Amorphous MnOx catalysts were successfully synthesized and exhibited hierarchical porous structures.
  • Increasing calcination temperature from 550 to 850 °C transformed amorphous MnOx to crystalline phases.
  • Amorphous MnOx demonstrated significantly higher catalytic activity for soot oxidation compared to crystalline counterparts.
  • Enhanced activity of amorphous MnOx is attributed to improved low-temperature reducibility, abundant surface active oxygen, and higher Mn4+ content.
  • NO presence in O2 promoted soot oxidation via a NO2-assisted mechanism.

Conclusions:

  • Amorphous manganese oxide catalysts prepared by CSCS are highly effective for soot combustion.
  • Hierarchical porous structure and specific surface properties of amorphous MnOx are key to their superior performance.
  • Understanding the influence of synthesis parameters, like calcination temperature, is vital for optimizing MnOx catalysts.
  • The findings offer insights for designing efficient amorphous catalysts for environmental remediation applications.