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Related Concept Videos

Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

9.8K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
9.8K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

10.7K
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

9.7K
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.
9.7K
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

5.5K
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.
5.5K
Oxidation of Alcohols02:37

Oxidation of Alcohols

12.7K
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:
12.7K
Catalysis02:50

Catalysis

26.5K
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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Updated: May 23, 2025

Functionalization and Dispersion of Carbon Nanomaterials Using an Environmentally Friendly Ultrasonicated Ozonolysis Process
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Functionalization and Dispersion of Carbon Nanomaterials Using an Environmentally Friendly Ultrasonicated Ozonolysis Process

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High-Entropy Modulated High-Spin Localized Cobalt Sites Enhance Catalytic Ozonation for Efficient Odor Control.

Rumeng Zhang1, Hao Zhou1, Tao Shao1

  • 1School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, P.R. China.

Angewandte Chemie (International Ed. in English)
|May 14, 2025
PubMed
Summary

High-entropy catalysts enhance catalytic ozonation for environmental remediation by stabilizing key atomic oxygen species. This strategy boosts pollutant degradation efficiency and catalyst stability, offering a promising approach for cleaner technologies.

Keywords:
Catalytic ozonationHigh‐entropy coordinationHigh‐spin Co(III)Methyl mercaptan (CH3SH)Odor control

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Area of Science:

  • Environmental Chemistry
  • Catalysis
  • Materials Science

Background:

  • Catalytic ozonation is vital for complete organic pollutant mineralization in environmental remediation.
  • Catalyst electronic properties and interfacial interactions are critical for efficient ozonation, often limited by spin-forbidden transitions.
  • Interfacial atomic metal-oxygen species (*O) are key descriptors for reactive species generation and catalytic activity.

Purpose of the Study:

  • To modulate the electronic structure of cobalt oxide catalysts using a high-entropy strategy.
  • To enhance catalytic ozonation efficiency by stabilizing interfacial atomic oxygen species (*O).
  • To investigate the mechanism of enhanced catalytic activity in high-entropy cobalt oxide (HE-Co3O4).

Main Methods:

  • Synthesis of high-entropy cobalt oxide (HE-Co3O4) via a high-entropy strategy.
  • Catalytic ozonation experiments for methyl mercaptan (CH3SH) degradation.
  • Characterization using electron paramagnetic resonance (EPR), magnetization hysteresis (M-H) measurements, and in situ Raman spectroscopy.
  • Computational analysis using density functional theory (DFT).

Main Results:

  • HE-Co3O4 demonstrated a five-fold higher degradation rate for CH3SH compared to Co3O4, with 63-fold higher mass activity than commercial MnO2.
  • The catalyst exhibited excellent stability over 24 hours at 298 K.
  • EPR and M-H measurements confirmed the transition of Co3+ to high-spin states in HE-Co3O4.
  • DFT calculations revealed enhanced Co 3d-O 2p orbital hybridization, facilitating an *O-mediated pathway.

Conclusions:

  • The high-entropy strategy effectively modulates catalyst electronic structures, stabilizing crucial *O surface species.
  • HE-Co3O4 significantly enhances catalytic ozonation efficiency and stability for environmental remediation.
  • The findings offer insights into designing advanced catalysts by targeting electronic properties for ozone-catalyzed pollutant degradation.