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Open AccessArticle

Preferential CO Oxidation in H2 over Au/La2O3/Al2O3 Catalysts: The Effect of the Catalyst Reduction Method

1
Department of Chemical Engineering and Department of Energy Systems Research, Ajou University, 206, World cup-ro, Yeongtong-Gu, Suwon 16499, Korea
2
Department of Chemistry, School of Advanced Sciences, Kalasalingam Academy of Research and Education, Krishnan koil, Tamil Nadu 626 126, India
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(5), 183; https://doi.org/10.3390/catal8050183
Received: 2 April 2018 / Revised: 18 April 2018 / Accepted: 18 April 2018 / Published: 30 April 2018
(This article belongs to the Special Issue Catalysts for Hydrogen Purification for Fuel Cell Applications)
We investigated the influence of the reduction method on the preferential oxidation of CO in H2 (CO-PROX) over Au/La2O3/Al2O3 catalysts. An Au/La2O3/Al2O3 sample, prepared using deposition–precipitation with urea, was reduced by chemical reduction with NaBH4 or glycerol. Several techniques, such as diffuse-reflectance infrared Fourier-transform spectroscopy after CO adsorption (CO-DRIFTS), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) were used to characterize the catalysts. Additionally, the catalysts were examined by in situ DRIFTS during methanol decomposition. The results reveal that the reduction method affects the average particle size and electronic state of gold, as well as the characteristics of the CO–Au0 interactions. The best CO-PROX performance was observed for the catalyst chemically reduced using NaBH4 with a NaBH4/Au molar ratio of 35. This catalyst contained gold particles with size of ~4 nm, for which the XPS binding energy was lower than that of metallic gold. View Full-Text
Keywords: gold; Au/La2O3/Al2O3; chemical reduction; NaBH4; glycerol; CO-PROX; effect of reduction method gold; Au/La2O3/Al2O3; chemical reduction; NaBH4; glycerol; CO-PROX; effect of reduction method
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MDPI and ACS Style

Lakshmanan, P.; Park, E.D. Preferential CO Oxidation in H2 over Au/La2O3/Al2O3 Catalysts: The Effect of the Catalyst Reduction Method. Catalysts 2018, 8, 183.

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