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Insight into the chemical adsorption properties of CO molecules on supported Au or Cu and hybridized Au-CuO nanoparticles

Abstract

Although Au clusters in nanosizes have been well developed for many applications, there still lacks of fundamental understanding of its adsorption/activation behaviors in the catalytic applications, especially with some other elements act as either promotion or hybridization. Au hybridized with Cu element is a most investigated system that Cu in the same element group with Au displays similar physicochemical properties. However, their hybrids in terms of chemical states and adsorption/activation properties are not well understood. In this work, typical γ-Al2O3 supported Au and CuO as well as Au-CuO nanoparticles were prepared and characterized to explore the adsorption/activation properties in depth by using CO as probing molecules using advanced techniques, such as XPS, HR-TEM, temperature programmed experiments and operando DRIFT combining with mass spectra. It was found out that the gold and copper both can acted as active sites during CO adsorption and activation. The CO-TPD and operando DRIFT results also revealed that CO molecules were able to react with surface oxygenated species resulting in the direct formation of CO2 over three samples in the absence of gaseous O2.The gold step sites (Austep) were more readily participated in the reaction especially under gaseous O2-free conditions. During adsorption, CO molecules were preferentially adsorbed on Au0 sites at lower temperature, which was nearly as 2-fold over that on Cu0 sites. However, competitive adsorption occurred between CO adsorbed on Au0 and Cu0 with increased reaction temperature, and the synergy between Au and Cu compositions was too strong to suppress the adsorption and activation of the CO molecules. The dynamic adsorption equilibrium during 120-200 oC caused the appearance of hysteresis platform of performance.

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Publication details

The article was accepted on 11 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR06018A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Insight into the chemical adsorption properties of CO molecules on supported Au or Cu and hybridized Au-CuO nanoparticles

    J. Luo, Y. Liu, Y. Niu, Q. Jiang, R. Huang, B. Zhang and D. S. Su, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06018A

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