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Journal of Sol-Gel Science and Technology
Published in: Journal of Sol-Gel Science and Technology 3/2018

23-05-2018 | Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications

Au/M-TiO2 nanotube catalysts (M=Ce, Ga, Co, Y): preparation, characterization and their catalytic activity for CO oxidation

Authors: Jiuli Guo, Qiuwan Han, Siyuan Zhong, Baolin Zhu, Weiping Huang, Shoumin Zhang

Published in: Journal of Sol-Gel Science and Technology | Issue 3/2018

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Abstract

The M-modified TiO2 nanotubes (NTs) (M = Ce, Ga, Co, Y, 2.0 wt%) were synthesized by combining sol-gel method with hydrothermal treatment, based on which gold was loaded by the deposition–precipitation approach. These catalysts were loaded with 1.5 wt% gold and calcined at 300 °C, and their catalytic performance was compared with Au/TiO2 NTs in CO oxidation. TEM results manifested Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) had smaller gold nanoparticles than Au/TiO2 NTs. Patterns of XPS revealed the presence of the strong interaction between gold and support in Au/M-TiO2 NTs (M = Ce, Ga, Co, Y). Ce4+, Ga3+, Co2+, and Y3+ ions were present as CeO2, Ga2O3, CoO, and Y2O3 in Au/M-TiO2 NTs (M = Ce, Ga, Co, Y), respectively. Based on O2-TPD studies, Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) provided new O2 adsorption sites for the adsorption and activation of oxygen in CO oxidation. M (M = Ce, Ga, Co, Y) modifying performed the positive effect on CO oxidation activity and Au/Y-TiO2 NTs showed the highest activity among these catalysts. Additionally, Au/Y-TiO2 NTs also performed excellent high-temperature stability. It was likely that the strong interaction between gold and support created the small size of gold nanoparticles, large O2 adsorption and plenty of defects, thereby enhancing the catalytic activity of Au/M-TiO2 NTs (M = Ce, Ga, Co, Y).
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Appendix
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Metadata
Title
Au/M-TiO2 nanotube catalysts (M=Ce, Ga, Co, Y): preparation, characterization and their catalytic activity for CO oxidation
Authors
Jiuli Guo
Qiuwan Han
Siyuan Zhong
Baolin Zhu
Weiping Huang
Shoumin Zhang
Publication date
23-05-2018
Publisher
Springer US
Published in
Journal of Sol-Gel Science and Technology / Issue 3/2018
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-018-4691-1

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