TY - JOUR
T1 - Kinetics of Lifetime Changes in Bimetallic Nanocatalysts Revealed by Quick X-ray Absorption Spectroscopy
AU - Filez, Matthias
AU - Poelman, Hilde
AU - Redekop, Evgeniy A.
AU - Galvita, Vladimir V.
AU - Alexopoulos, Konstantinos
AU - Meledina, Maria
AU - Ramachandran, Ranjith K.
AU - Dendooven, Jolien
AU - Detavernier, Christophe
AU - Van Tendeloo, Gustaaf
AU - Safonova, Olga V.
AU - Nachtegaal, Maarten
AU - Weckhuysen, Bert M.
AU - Marin, Guy B.
PY - 2018/9/17
Y1 - 2018/9/17
N2 - 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 Pt13In9 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 Pt13In9 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.
AB - 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 Pt13In9 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 Pt13In9 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.
KW - alloying segregation
KW - bimetallic nanoparticles
KW - in situ time-resolved X-ray absorption spectroscopy
KW - kinetics
KW - oxidation-reduction
U2 - 10.1002/anie.201806447
DO - 10.1002/anie.201806447
M3 - Article
SN - 1433-7851
VL - 57
SP - 12430
EP - 12434
JO - Angewandte Chemie-International Edition
JF - Angewandte Chemie-International Edition
IS - 38
ER -