The Dynamic Structure of Au38(SR)24 Nanoclusters Supported on CeO2 upon Pretreatment and CO Oxidation | Zendy

Stephan Pollitt | Zendy; Vera Truttmann | Zendy; Thomas Haunold | Zendy; Clara García | Zendy; W. Olszewski | Zendy; Jordi Llorca | Zendy; Noelia Barrabés | Zendy; Günther Rupprechter | Zendy

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The Dynamic Structure of Au₃₈(SR)₂₄ Nanoclusters Supported on CeO₂ upon Pretreatment and CO Oxidation

Author(s) -

Stephan Pollitt,

Vera Truttmann,

Thomas Haunold,

Clara García,

W. Olszewski,

Jordi Llorca,

Noelia Barrabés,

Günther Rupprechter

Publication year - 2020

Publication title -

acs catalysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.898

H-Index - 198

ISSN - 2155-5435

DOI - 10.1021/acscatal.0c01621

Subject(s) - nanoclusters , x ray photoelectron spectroscopy , cluster (spacecraft) , oxidizing agent , catalysis , diffuse reflectance infrared fourier transform , chemistry , photochemistry , spectroscopy , transmission electron microscopy , absorption (acoustics) , infrared spectroscopy , fourier transform infrared spectroscopy , absorption spectroscopy , nanoparticle , crystallography , materials science , nanotechnology , chemical engineering , photocatalysis , optics , organic chemistry , physics , quantum mechanics , computer science , engineering , composite material , programming language

Atomically precise thiolate protected Au nanoclusters Au 38 (SC 2 H 4 Ph) 24 on CeO 2 were used for in-situ (operando) extended X-ray absorption fine structure/diffuse reflectance infrared fourier transform spectroscopy and ex situ scanning transmission electron microscopy-high-angle annular dark-field imaging/X-ray photoelectron spectroscopy studies monitoring cluster structure changes induced by activation (ligand removal) and CO oxidation. Oxidative pretreatment at 150 °C "collapsed" the clusters' ligand shell, oxidizing the hydrocarbon backbone, but the S remaining on Au acted as poison. Oxidation at 250 °C produced bare Au surfaces by removing S which migrated to the support (forming Au + -S), leading to highest activity. During reaction, structural changes occurred via CO-induced Au and O-induced S migration to the support. The results reveal the dynamics of nanocluster catalysts and the underlying cluster chemistry.

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