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Nano-Sized Au/CeO2 Catalysts for Total and Selective CO Oxidation

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Abstract:

Au/CeO2 catalysts prepared by a deposition-precipitation and a co-precipitation method were applied to CO oxidation in the absence and presence of hydrogen. The transmission electron microscope (TEM), the temperature programmed reduction (TPR), and the X-ray absorption near edge structure (XANES) were conducted to probe structural and electronic properties of gold. Au2O3 was determined to be mainly present when Au/CeO2 was prepared by a deposition-precipitation method. However, the metallic gold was observed in a co-precipitated Au/CeO2 catalyst. Au/CeO2 containing oxidized gold species, prepared by a deposition-precipitation method, showed the decreasing CO conversion with a reaction time, which accompanied the reduction of gold from Au(+3) to Au(0). However, co-precipitated Au/CeO2 showed the stable CO conversion. The effect of pretreatment condition on CO oxidation was also examined. These results support that Au/CeO2 catalyst containing oxidized gold species was superior to Au/CeO2 catalyst containing the metallic gold for CO oxidation. This Au/CeO2 catalyst was also active for the selective CO oxidation in the presence of hydrogen.

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Periodical:

Solid State Phenomena (Volumes 124-126)

Pages:

1749-1752

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.124-126.1749

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Online since:

June 2007

Authors:

Eun Yong Ko, Eun Duck Park, Hyun Chul Lee, Doo Hwan Lee, Soon Ho Kim

Keywords:

Au/CeO2, CO Oxidation, Fuel Cell (FC), Gold Catalyst, Pre-Treatment, PROX

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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