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Bimetallic Ag‐Pt Sub‐nanometer Supported Clusters as Highly Efficient and Robust Oxidation Catalysts
Author(s) -
Negreiros Fabio R.,
Halder Avik,
Yin Chunrong,
Singh Akansha,
Barcaro Giovanni,
Sementa Luca,
Tyo Eric C.,
Pellin Michael J.,
Bartling Stephan,
MeiwesBroer KarlHeinz,
Seifert Sönke,
Sen Prasenjit,
Nigam Sandeep,
Majumder Chiranjib,
Fukui Nobuyuki,
Yasumatsu Hisato,
Vajda Stefan,
Fortunelli Alessandro
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201709784
Subject(s) - bimetallic strip , catalysis , nanometre , amorphous solid , materials science , chemical engineering , nanotechnology , phase (matter) , heterogeneous catalysis , chemistry , crystallography , organic chemistry , engineering , composite material
A combined experimental and theoretical investigation of Ag‐Pt sub‐nanometer clusters as heterogeneous catalysts in the CO→CO 2 reaction (COox) is presented. Ag 9 Pt 2 and Ag 9 Pt 3 clusters are size‐selected in the gas phase, deposited on an ultrathin amorphous alumina support, and tested as catalysts experimentally under realistic conditions and by first‐principles simulations at realistic coverage. In situ GISAXS/TPRx demonstrates that the clusters do not sinter or deactivate even after prolonged exposure to reactants at high temperature, and present comparable, extremely high COox catalytic efficiency. Such high activity and stability are ascribed to a synergic role of Ag and Pt in ultranano‐aggregates, in which Pt anchors the clusters to the support and binds and activates two CO molecules, while Ag binds and activates O 2 , and Ag/Pt surface proximity disfavors poisoning by CO or oxidized species.