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• W4286203285 endingPage "12518" @default.
• W4286203285 startingPage "12507" @default.
• W4286203285 abstract "Recent experiments have demonstrated catalysis by single transition-metal atoms supported on metal–organic frameworks (MOF) but have yet to decipher the role of the transition-metal oxidation state and the reaction mechanism. In this work, we present a study of the aerobic CO oxidation reaction on single Cu atoms supported on the UiO-66 MOF. Characterization of the Cu@UiO-66 catalyst after reduction via infrared spectroscopy of a CO probe molecule reveals the presence of both Cu(I) and Cu(II) oxidation states. Operando infrared spectroscopic experiments further show both oxidation states are also present during reaction, and subsequent mechanistic studies using quantum mechanical calculations have therefore examined the reaction with both Cu(I) and Cu(II). The calculations reveal a variety of different Langmuir–Hinshelwood CO oxidation mechanisms, including those involving coordination of only O2 to Cu at the rate-limiting transition state or both CO and O2. Overall, CO oxidation on Cu(II)@UiO-66 exhibits a lower maximum energetic span than on Cu(I) and is therefore predicted to be faster under operational conditions for most methods examined. The reaction mechanisms for MOF-supported Cu single atoms differ from those involving single-Cu atoms on metal-oxide supports, which opens new avenues for increasingly efficient catalysis." @default.
• W4286203285 created "2022-07-21" @default.
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• W4286203285 date "2022-07-21" @default.
• W4286203285 modified "2023-09-27" @default.
• W4286203285 title "Catalytic CO Oxidation by Cu Single Atoms on the UiO-66 Metal–Organic Framework: The Role of the Oxidation State" @default.
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• W4286203285 doi "https://doi.org/10.1021/acs.jpcc.2c03463" @default.
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