Kinetics of Lifetime Changes in Bimetallic Nanocatalysts Revealed by Quick X-ray Absorption Spectroscopy.
Angew Chem Int Ed Engl
; 57(38): 12430-12434, 2018 Sep 17.
Article
em En
| MEDLINE
| ID: mdl-30067303
ABSTRACT
Alloyed metal nanocatalysts are of environmental and economic importance in a plethora of chemical technologies. During the catalyst lifetime, supported alloy nanoparticles undergo dynamic changes which are well-recognized but still poorly understood. High-temperature O2 -H2 redox cycling was applied to mimic the lifetime changes in model Pt13 In9 nanocatalysts, while monitoring the induced changes by inâ
situ quick X-ray absorption spectroscopy with one-second resolution. The different reaction steps involved in repeated Pt13 In9 segregation-alloying are identified and kinetically characterized at the single-cycle level. Over longer time scales, sintering phenomena are substantiated and the intraparticle structure is revealed throughout the catalyst lifetime. The inâ
situ time-resolved observation of the dynamic habits of alloyed nanoparticles and their kinetic description can impact catalysis and other fields involving (bi)metallic nanoalloys.
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MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2018
Tipo de documento:
Article
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Bélgica