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Oxidative Cleavage of Alkenes: Ozonolysis

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Catalysis

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Radical Autoxidation

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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation

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Published on: April 11, 2014

Localized Oxidative Catalytic Reactions Triggered by Cavitation Bubbles Confinement on Copper Oxide Microstructured

Valarmathi Mahendran¹, Quang Thang Trinh², Xie Zhangyue³

¹CNRS, Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP) (ENSI-Poitiers), B1, 1 rue Marcel Doré, 86073, Poitiers, France.

Angewandte Chemie (International Ed. in English)

|October 14, 2024

Summary

Engineered copper oxide (CuO) particles enhance sonocatalysis by directing acoustic energy to the catalyst surface. This localized heating enables efficient pollutant degradation, advancing energy-efficient catalytic processes.

Keywords:

Catalytic cavitation agent Effective local temperature Localised heating Ultrasound irradiation cavitation nucleation

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

Area of Science:

Materials Science
Chemical Engineering
Physical Chemistry

Background:

Efficient energy management is key to overcoming activation energy barriers in catalysis, reducing costs and CO2 emissions.
Sonocatalysis offers potential for energy-efficient chemical transformations, but energy dissipation in bulk solutions remains a challenge.

Purpose of the Study:

To design and engineer CuO particles as efficient cavitation nuclei and catalysts for selective acoustic energy transfer.
To investigate the localized heating effects on CuO particle surfaces during cavitation for enhanced catalytic activity.

Main Methods:

Engineered CuO particles with multiple gas-stabilizing sites were designed to act as cavitation nuclei and catalysts.
A chemical thermometric approach was employed to measure localized surface temperatures during cavitation bubble implosions.
Density functional theory (DFT) calculations were performed to analyze reaction mechanisms on the CuO (111) surface.

Main Results:

The engineered CuO particles demonstrated superior cavitation properties at lower acoustic pressures, directing energy to the catalyst surface.
Localized surface temperatures reached an equivalent of approximately 360°C during bubble implosions.
Efficient catalysis of oxidative reactions was achieved using an organic pollutant probe molecule, facilitated by the localized heating effect.

Conclusions:

The developed CuO particle design enables efficient and selective acoustic energy transfer in sonocatalysis.
Localized high temperatures generated on the catalyst surface significantly enhance the efficiency of pollutant degradation.
This approach represents a significant advancement in sonocatalytic systems, promoting efficient energy utilization in catalytic reactions.