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

  • Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications
  • Published:
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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).

Highlights

  • Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) were successfully prepared for the first time.

  • Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) was highly efficient and sintering-resistant for CO oxidation.

  • Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) possessed better activity compared with Au/TiO2 NTs.

  • Gold and support acted synergistically for the enhancement of property in Au/M-TiO2 NTs (M = Ce, Ga, Co, Y).

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21271110 21373120 and 21271107) and MOE Innovation Team of China (IRT13022). This work was supported by Tianjin Key Laboratory for photoelectric Materials and Devices, Tianjin University of Technology, Tianjin 300384, China.

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  1. Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry (MOE), and TKL of Metal and Molecule Based Material Chemistry, Nankai University, Tianjin, 300071, China

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

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  1. Jiuli Guo
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  2. Qiuwan Han
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  3. Siyuan Zhong
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Correspondence to Shoumin Zhang.

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Guo, J., Han, Q., Zhong, S. et al. Au/M-TiO2 nanotube catalysts (M=Ce, Ga, Co, Y): preparation, characterization and their catalytic activity for CO oxidation. J Sol-Gel Sci Technol 86, 699–710 (2018). https://doi.org/10.1007/s10971-018-4691-1

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  • DOI: https://doi.org/10.1007/s10971-018-4691-1

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