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Kinetics of Lifetime Changes in Bimetallic Nanocatalysts Revealed by Quick X‐ray Absorption Spectroscopy
Author(s) -
Filez Matthias,
Poelman Hilde,
Redekop Evgeniy A.,
Galvita Vladimir V.,
Alexopoulos Konstantinos,
Meledina Maria,
Ramachandran Ranjith K.,
Dendooven Jolien,
Detavernier Christophe,
Van Tendeloo Gustaaf,
Safonova Olga V.,
Nachtegaal Maarten,
Weckhuysen Bert M.,
Marin Guy B.
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201806447
Subject(s) - nanomaterial based catalyst , bimetallic strip , catalysis , nanoparticle , materials science , x ray absorption spectroscopy , alloy , kinetics , absorption spectroscopy , chemical engineering , spectroscopy , absorption (acoustics) , nanotechnology , metal , sintering , analytical chemistry (journal) , chemistry , metallurgy , environmental chemistry , composite material , organic chemistry , optics , physics , engineering , quantum mechanics
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 O 2 –H 2 redox cycling was applied to mimic the lifetime changes in model Pt 13 In 9 nanocatalysts, while monitoring the induced changes by in situ quick X‐ray absorption spectroscopy with one‐second resolution. The different reaction steps involved in repeated Pt 13 In 9 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 in 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.