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Restructuring of AuPd nanoparticles studied by a combined XAFS/DRIFTS approach

DOI: 10.1021/acs.chemmater.5b00866 DOI Help

Authors: Emma Gibson (UK Catalysis Hub, Research Complex at Harwell; University College London) , Andrew Beale (UK Catalysis Hub, Research Complex at Harwell; University College London) , C. Richard A. Catlow (UK Catalysis Hub, Research Complex at Harwell; University College London) , Arunabhiram Chutia (UK Catalysis Hub, Research Complex at Harwell; University College London) , Diego Gianolio (Diamond Light Source) , Anna Gould (UK Catalysis Hub, Research Complex at Harwell; University College London) , Anna Kroner (Diamond Light Source) , Khaled M. H. Mohammed (UK Catalysis Hub, Research Complex at Harwell; University College London; Sohag University) , Michal Perdjon (UK Catalysis Hub, Research Complex at Harwell; University College London) , Scott Rogers (UK Catalysis Hub, Research Complex at Harwell; University College London) , Peter P. Wells (UK Catalysis Hub, Research Complex at Harwell; University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry Of Materials , VOL 27 (10)

State: Published (Approved)
Published: May 2015
Diamond Proposal Number(s): 8071

Open Access Open Access

Abstract: The use of AuPd nanoparticles in catalysis is widespread, with the activity being attributed to their precise structural properties. We demonstrate the restructuring of AuPd nanoparticles under CO oxidation conditions using a combined XAFS/DRIFTS approach. The fresh catalyst exhibits PdO islands at the surface of the nanoparticles, which are reduced under reaction conditions, a process observed via both DRIFTS and Pd K-edge XAFS measurements. From the EXAFS analysis alone the nanoparticles were observed to have a Au rich core with an outer region of intimately mixed Au and Pd atoms. This structure was found to remain mostly unaltered throughout reaction. However, the DRIFTS spectra showed that although Au was present on the surface during the initial stages of reaction the surface rearranged just before light-off, and contained only Pd atoms thereafter. This study highlights the advantage of this combined approach, where both the surface structure and local environment of the constituent metals can be probed simultaneously, allowing a complete picture of the restructuring of these bimetallic particles to be obtained under reaction conditions.

Journal Keywords: Catalysts; Gold; Metal nanoparticles; Nanoparticles; Palladium

Subject Areas: Chemistry, Materials


Instruments: B18-Core EXAFS

Added On: 11/05/2015 11:20

Documents:
acs.chemmater.5b00866.pdf

Discipline Tags:

Physical Chemistry Catalysis Chemistry Materials Science Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS)