What is it about?

We have demonstrated that by increasing by increasing the hydrogen pressure it is possible to lower the temperature necessary for complete reduction of γ-Fe2O3 nanoparticles to α-Fe from 390°C down to 210°C. This significant improvement in reduction temperature is beneficial for the final particle morphology. Coalescence and sintering of the particles accompanied by surface area loss which occurs at elevated temperatures (e.g. 390°C), can be suppressed when reduction is performed at 210°C.

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Why is it important?

Production of fine, surfactant - free metallic nanoparticles with high surface area is important for various applications such as magnetic nanocomposites and catalysts.

Perspectives

This approach could also be extended beyond iron to reduction of other metal oxides.

Imants Dirba
Technische Universitat Darmstadt

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This page is a summary of: Production of Fe nanoparticles from γ-Fe2O3 by high-pressure hydrogen reduction, Nanoscale Advances, January 2020, Royal Society of Chemistry, DOI: 10.1039/d0na00635a.
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