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Title
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Kinetics of lifetime changes in bimetallic nanocatalysts revealed by quick X-ray absorption spectroscopy
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Author
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Abstract
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| 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 Pt13In9 nanocatalysts, while monitoring the induced changes by insitu 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 insitu 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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Language
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English
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Source (journal)
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Angewandte Chemie: international edition in English. - Weinheim
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Publication
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Weinheim
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2018
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ISSN
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1433-7851
0570-0833
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DOI
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10.1002/ANIE.201806447
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Volume/pages
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57
:38
(2018)
, p. 12430-12434
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ISI
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000444225100038
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Pubmed ID
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30067303
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Full text (Publisher's DOI)
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Full text (open access)
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