Dynamics of Pd Dopant Atoms Inside Au Nanoclusters During Catalytic CO Oxidation

Overview

Journal J Phys Chem C Nanomater Interfaces

Publisher American Chemical Society

Date 2020 Nov 6

PMID 33154783

Citations 10

Authors

Clara Garcia

Vera Truttmann

Irene Lopez

Thomas Haunold

Carlo Marini

Christoph Rameshan

Ernst Pittenauer

Peter Kregsamer

Klaus Dobrezberger

Michael Stoger-Pollach

Noelia Barrabes

Gunther Rupprechter

Affiliations

Soon will be listed here.

Abstract

Doping gold nanoclusters with palladium has been reported to increase their catalytic activity and stability. PdAu nanoclusters, with the Pd dopant atom located at the center of the Au cluster core, were supported on titania and applied in catalytic CO oxidation, showing significantly higher activity than supported monometallic Au nanoclusters. After pretreatment, DRIFTS spectroscopy detected CO adsorbed on Pd during CO oxidation, indicating migration of the Pd dopant atom from the Au cluster core to the cluster surface. Increasing the number of Pd dopant atoms in the Au structure led to incorporation of Pd mostly in the S-(M-S) protecting staples, as evidenced by XAFS. A combination of oxidative and reductive thermal pretreatment resulted in the formation of isolated Pd surface sites within the Au surface. The combined analysis of XAFS, DRIFTS, and XPS thus revealed the structural evolution of bimetallic PdAu nanoclusters, yielding a Pd single-site catalyst of 2.7 nm average particle size with improved CO oxidation activity.

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