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We developed the non-thermal reduction of metal oxides without any reducing agent by use of microwave irradiation, which possibly contributes to the drastic reduction of CO2 emission during metal production processes.
In this process, we have observed surface reduction of metal oxides such as TiO2 without any reducing agent and obtained a dark-colored solid specimen.
Reflectance spectroscopy, resistance measurement and emission spectroscopy verified that TiO2 surface was directly reduced to the lower oxygenated condition.
This is different from thermal reduction process, and suggests that microwave irradiation enables to not only act as a heat source but also promote the reduction of TiO2 without any reducing agent.


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