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Plasma treating mixed metal oxides to improve oxidative performance via defect generation

Materials, ISSN: 1996-1944, Vol: 12, Issue: 7
2019
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Article Description

The generation of structural defects in metal oxide catalysts offers a potential pathway to improve performance. Herein, we investigated the effect of thermal hydrogenation and low-temperature plasma treatments on mixed SiO/TiO materials. Hydrogenation at 500 °C resulted in the reduction of the material to produce Ti in the bulk TiO. In contrast, low temperature plasma treatment for 10 or 20 min generated surface Ti3+ species via the removal of oxygen on both the neat and hydrogenated material. Assessing the photocatalytic activity of the materials demonstrated a 40-130% increase in the rate of formic acid oxidation after plasma treatment. A strong relationship between the Ti content and catalyst activity was established, although a change in the Si-Ti interaction after plasma treating of the neat SiO/TiO material was found to limit performance, and suggests that performance is not determined solely by the presence of Ti.

Bibliographic Details

Horlyck, Jonathan; Nashira, Alimatun; Lovell, Emma; Daiyan, Rahman; Bedford, Nicholas; Wei, Yuexing; Amal, Rose; Scott, Jason

MDPI AG

Materials Science

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