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Heterogeneous Catalysis

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Preparation and Reactivity of Gasless Nanostructured Energetic Materials

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Insights into Mechanochemical Solid-State Ball-Milling Reaction: Monitoring Transition from Heterogeneous to

Eun Sul Go¹, Eun Ji Hong¹, Ji Yeong Lee¹

¹Department of Chemistry, Jeonbuk National University, Jeonju 54896, Republic of Korea.

|June 27, 2025

Summary

Mechanochemical reactions can be heterogeneous or homogeneous. Ball milling transforms heterogeneous lactide mixtures into homogeneous phases, influencing copolymerization outcomes and enabling mechano-exclusive reaction designs.

Keywords:

ball-milling heterogeneous reaction homogeneous reaction mechanochemistry

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Area of Science:

Materials Science
Polymer Chemistry
Chemical Engineering

Background:

Mechanochemical synthesis is advancing, prompting investigation into reaction mechanisms.
Solid-state mechanochemical reactions can be faster than solution-based ones, raising questions about their nature.

Purpose of the Study:

To determine if mechanochemical reactions are homogeneous or heterogeneous.
To understand how mixing influences copolymerization in mechanochemical processes.

Main Methods:

Utilized a model system of l-lactide (LLA) and d-lactide (DLA) copolymerization.
Employed powder X-ray diffraction (PXRD), nuclear magnetic resonance, and differential scanning calorimetry for monitoring.
Investigated the effect of vibratory ball milling conditions on monomer mixing and reaction outcomes.

Main Results:

Vibratory ball milling rapidly homogenized LLA and DLA mixtures within one minute.
Early-stage copolymerization, under heterogeneous conditions, yielded multiblock copolymers.
Prolonged polymerization under more homogeneous conditions resulted in atactic poly-(lactic acid).

Conclusions:

Mechanochemical reactions exhibit a transition from heterogeneous to homogeneous phases.
The degree of monomer mixing significantly impacts copolymerization products.
This heterogeneity-to-homogeneity transition offers potential for novel mechano-exclusive reaction designs.