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Radical Oxidation of Allylic and Benzylic Alcohols

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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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Updated: Sep 22, 2025

Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate

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Published on: June 18, 2020

Ozone Decomposition below Room Temperature Using Mn-based Mullite YMn₂O₅.

Xiang Wan¹, Lijing Wang¹, Shen Zhang¹

¹College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071, China.

Environmental Science & Technology

|May 26, 2022

Summary

This summary is machine-generated.

A novel ternary oxide catalyst, YMn2O5, achieves efficient ozone decomposition at super-low temperatures without energy input. This breakthrough offers a durable and effective solution for ozone degradation, even in cold environments.

Keywords:

density functional theory mullite oxide ozone decomposition singly coordinated oxygen ultra-low-temperature activity zero energy consumption

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Area of Science:

Materials Science
Catalysis
Environmental Chemistry

Background:

Ozone (O3) decomposition is crucial for air purification and environmental remediation.
Existing catalysts often require high temperatures or energy input for efficient ozone decomposition.
Developing low-temperature catalysts is essential for energy-efficient environmental applications.

Purpose of the Study:

To develop a novel catalyst for efficient ozone decomposition at super-low temperatures.
To investigate the catalytic mechanism and durability of the proposed catalyst.
To establish a new benchmark for low-temperature ozone decomposition catalysts.

Main Methods:

Synthesis and characterization of the ternary oxide catalyst YMn2O5.
Ozone decomposition activity testing at temperatures down to -40 °C.
Durability assessment through extended reaction testing.
Surface analysis using O2-temperature-programmed desorption (O2-TPD).
In situ Raman spectroscopy and density functional theory (DFT) calculations to elucidate the reaction mechanism.

Main Results:

YMn2O5 demonstrated efficient ozone decomposition starting at -40 °C, reaching 100% conversion at -5 °C.
The catalyst exhibited excellent durability, maintaining its structure and performance after 100 hours of reaction.
Active sites were identified as Mn3+ sites with singly coordinated oxygen.
DFT calculations revealed a low activation barrier (0.29 eV) following the Eley-Rideal mechanism.

Conclusions:

YMn2O5 is a highly effective catalyst for low-temperature ozone decomposition without energy consumption.
The catalyst's performance is attributed to moderate Mn-O bonding strength and specific active sites.
This finding presents a significant advancement in developing energy-efficient ozone degradation technologies.