Au-decorated Ce-Ti mixed oxides for efficient CO preferential photo-oxidation

ACS Applied Materials & Interfaces
Antonia Infantes-MolinaElisa Moretti

Abstract

We investigated the photocatalytic behavior of gold nanoparticles supported on CeO2-TiO2 nanostructured matrices in the CO preferential oxidation in H2-rich stream (photo CO-PROX), by modifying the electronic band structure of ceria through addition of titania and making it more suitable for interacting with free electrons excited in gold nanoparticles through SPR. CeO2 samples with different TiO2 concentrations (0-20 wt%) were prepared through a slow co-precipitation method in alkaline conditions. The synthetic route is surfactant-free and environmentally friendly. Au nanoparticles (< 1.0 wt% loading) were deposited on the surface of the CeO2-TiO2 oxides by deposition-precipitation. A benchmarking sample was also considered, prepared by standard fast co-precipitation, to assess how a peculiar morphology can affect the photocatalytic behavior. The samples appeared organized in a hierarchical needle-like structure, with different morphology depending on the Ti content and preparation method, with homogenously distributed Au nanoparticles decorating the Ce-Ti mixed oxides. The morphology influences the preferential photo-oxidation of CO to CO2 in excess of H2 under simulated solar light irradiation at room temperature and atmosph...Continue Reading

References

May 18, 2004·Nature Materials·Avelino CormaJean-Yves Chane-Ching
Dec 9, 2010·Journal of Nanoscience and Nanotechnology·Shalendra KumarChan Gyu Lee
Apr 28, 2016·Chemical Reviews·Tiziano MontiniPaolo Fornasiero
Feb 12, 2016·Light, Science & Applications·Xiang-Chao MaBai-Biao Huang
Oct 3, 2018·ACS Central Science·Graham J Hutchings
Nov 16, 2019·Advanced Science·Bin ZhangHan Zhang

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Methods Mentioned

BETA
surface plasmon resonance
X-ray
thermal treatment

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