The effect of the support on the surface composition of PtCu alloy nanocatalysts:In situ XPS and HS-LEIS studies

doi:10.1016/S1872-2067(17)62857-2

Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (7): 1229-1236.DOI: 10.1016/S1872-2067(17)62857-2

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The effect of the support on the surface composition of PtCu alloy nanocatalysts:In situ XPS and HS-LEIS studies

Junjie Huang, Yanying Song, Dongdong Ma, Yanping Zheng, Mingshu Chen, Huilin Wan

State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China

Online:2017-07-18 Published:2017-06-27
Contact: 10.1016/S1872-2067(17)62857-2
Supported by:
This work was supported by the National Basic Research Program of China (973 Program, 2013CB933102), the National Natural Science Foundation of China (21273178, 21573180, 91545204), and Xiamen-Zhuoyue Biomass Energy Co. Ltd.

Abstract

Abstract:

Supported PtCu alloys have been broadly applied in heterogeneous catalysis and electrocatalysis owing to their excellent catalytic performance and high CO tolerance. It is important to analyze the outermost surface composition of the supported alloy nanoparticles to understand the nature of the catalytically active sites. In this paper, homogeneous face-centered cubic PtCu nanoparticles with a narrow particle size distribution were successfully fabricated and dispersed on a high-surface-area TiO₂ powder support. The samples were oxidized and reduced in situ and then introduced into the ultrahigh vacuum chamber to measure the topmost surface composition by high-sensitivity low-energy ion scattering spectroscopy, and to determine the oxidation states of the elements by X-ray photoelectron spectroscopy. The surface composition and morphology, elemental distribu-tion, and oxidation states of the components were found to be significantly affected by the support and treatment conditions. The PtCu is de-alloyed upon oxidation with CuO wetting on the TiO₂ sur-face and re-alloyed upon reduction. Phase diagrams of the surface composition and the bulk com-position were plotted and compared for the supported and unsupported materials.

Key words: PtCu alloy, Bimetal catalyst, Surface composition, Phase diagram, In situ XPS-LEIS

Junjie Huang, Yanying Song, Dongdong Ma, Yanping Zheng, Mingshu Chen, Huilin Wan. The effect of the support on the surface composition of PtCu alloy nanocatalysts:In situ XPS and HS-LEIS studies[J]. Chinese Journal of Catalysis, 2017, 38(7): 1229-1236.

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The effect of the support on the surface composition of PtCu alloy nanocatalysts:In situ XPS and HS-LEIS studies

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