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- W4206828287 abstract "Abstract The behavior of single Pt atoms and small Pt clusters was investigated for high‐temperature oxidations. The high stability of these molecular sites in CHA is a key to intrinsic structure–performance descriptions of elemental steps such as O 2 dissociation, and subsequent oxidation catalysis. Subtle changes in the atomic structure of Pt are responsible for drastic changes in performance driven by specific gas/metal/support interactions. Whereas single Pt atoms and Pt clusters (> ca. 1 nm) are unable to activate, scramble, and desorb two O 2 molecules at moderate T (200 °C), clusters <1 nm do so catalytically, but undergo oxidative fragmentation. Oxidation of alkanes at high T is attributed to stable single Pt atoms, and the C‐H cleavage is inferred to be rate‐determining and less sensitive to changes in metal nuclearity compared to its effect on O 2 scrambling. In contrast, when combustion involves CO, catalysis is dominated by metal clusters, not single Pt atoms." @default.
- W4206828287 created "2022-01-25" @default.
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- W4206828287 date "2021-06-09" @default.
- W4206828287 modified "2023-10-18" @default.
- W4206828287 title "Single‐Site vs. Cluster Catalysis in High Temperature Oxidations" @default.
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- W4206828287 doi "https://doi.org/10.1002/ange.202102339" @default.
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