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Title: Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

Abstract

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 2/TiO 2 materials. Hydrogenation at 500 °C resulted in the reduction of the material to produce Ti 3+ in the bulk TiO 2. In contrast, low temperature plasma treatment for 10 or 20 min generated surface Ti 3+ 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 3+ content and catalyst activity was established, although a change in the Si–Ti interaction after plasma treating of the neat SiO 2/TiO 2 material was found to limit performance, and suggests that performance is not determined solely by the presence of Ti 3+.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGN
OSTI Identifier:
1601864
Resource Type:
Journal Article
Journal Name:
Materials
Additional Journal Information:
Journal Volume: 12; Journal Issue: 17; Journal ID: ISSN 1996-1944
Publisher:
MDPI
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Horlyck, Jonathan, Nashira, Alimatun, Lovell, Emma, Daiyan, Rahman, Bedford, Nicholas, Wei, Yuexing, Amal, Rose, and Scott, Jason. Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation. United States: N. p., 2019. Web. doi:10.3390/ma12172756.
Horlyck, Jonathan, Nashira, Alimatun, Lovell, Emma, Daiyan, Rahman, Bedford, Nicholas, Wei, Yuexing, Amal, Rose, & Scott, Jason. Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation. United States. doi:10.3390/ma12172756.
Horlyck, Jonathan, Nashira, Alimatun, Lovell, Emma, Daiyan, Rahman, Bedford, Nicholas, Wei, Yuexing, Amal, Rose, and Scott, Jason. Tue . "Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation". United States. doi:10.3390/ma12172756.
@article{osti_1601864,
title = {Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation},
author = {Horlyck, Jonathan and Nashira, Alimatun and Lovell, Emma and Daiyan, Rahman and Bedford, Nicholas and Wei, Yuexing and Amal, Rose and Scott, Jason},
abstractNote = {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 SiO2/TiO2 materials. Hydrogenation at 500 °C resulted in the reduction of the material to produce Ti3+ in the bulk TiO2. 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 Ti3+ content and catalyst activity was established, although a change in the Si–Ti interaction after plasma treating of the neat SiO2/TiO2 material was found to limit performance, and suggests that performance is not determined solely by the presence of Ti3+.},
doi = {10.3390/ma12172756},
journal = {Materials},
issn = {1996-1944},
number = 17,
volume = 12,
place = {United States},
year = {2019},
month = {8}
}

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