In:
Angewandte Chemie, Wiley, Vol. 130, No. 5 ( 2018-01-26), p. 1223-1227
Abstract:
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.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.201709784
Language:
English
Publisher:
Wiley
Publication Date:
2018
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