Dynamics of Pd Dopant Atoms inside Au Nanoclusters during Catalytic CO Oxidation | Zendy

Clara García | Zendy; Vera Truttmann | Zendy; Irene López | Zendy; Thomas Haunold | Zendy; Carlo Marini | Zendy; Christoph Rameshan | Zendy; Ernst Pittenauer | Zendy; Peter Kregsamer | Zendy; Klaus Dobrezberger | Zendy; Michael StögerPollach | Zendy; Noelia Barrabés | Zendy; Günther Rupprechter | Zendy

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Dynamics of Pd Dopant Atoms inside Au Nanoclusters during Catalytic CO Oxidation

Author(s) -

Clara García,

Vera Truttmann,

Irene López,

Thomas Haunold,

Carlo Marini,

Christoph Rameshan,

Ernst Pittenauer,

Peter Kregsamer,

Klaus Dobrezberger,

Michael StögerPollach,

Noelia Barrabés,

Günther Rupprechter

Publication year - 2020

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/acs.jpcc.0c05735

Subject(s) - nanoclusters , dopant , bimetallic strip , catalysis , x ray photoelectron spectroscopy , palladium , x ray absorption fine structure , materials science , cluster (spacecraft) , photochemistry , chemistry , inorganic chemistry , doping , spectroscopy , chemical engineering , nanotechnology , organic chemistry , physics , optoelectronics , quantum mechanics , computer science , engineering , programming language

Doping gold nanoclusters with palladium has been reported to increase their catalytic activity and stability. PdAu 24 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 25 nanoclusters. After pretreatment, operando 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) n protecting staples, as evidenced by in situ 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 in situ XAFS, operando DRIFTS, and ex situ 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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