Control of coordinatively unsaturated Zr sites in ZrO(2) for efficient C-H bond activation.
Control of coordinatively unsaturated Zr sites in ZrO(2) for efficient C-H bond activation.
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控制 ZrO2 中的配位不饱和 Zr 位点以实现有效的 C-H 键激活
DOI:
10.1038/s41467-018-06174-5
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发表时间:
2018-09-18
影响因子:
16.6
通讯作者:
Kondratenko EV
中科院分区:
文献类型:
--
作者:
Zhang Y;Zhao Y;Otroshchenko T;Lund H;Pohl MM;Rodemerck U;Linke D;Jiao H;Jiang G;Kondratenko EV
Due to the complexity of heterogeneous catalysts, identification of active sites and the ways for their experimental design are not inherently straightforward but important for tailored catalyst preparation. The present study reveals the active sites for efficient C–H bond activation in C1–C4 alkanes over ZrO2 free of any metals or metal oxides usually catalysing this reaction. Quantum chemical calculations suggest that two Zr cations located at an oxygen vacancy are responsible for the homolytic C–H bond dissociation. This pathway differs from that reported for other metal oxides used for alkane activation, where metal cation and neighbouring lattice oxygen form the active site. The concentration of anion vacancies in ZrO2 can be controlled through adjusting the crystallite size. Accordingly designed ZrO2 shows industrially relevant activity and durability in non-oxidative propane dehydrogenation and performs superior to state-of-the-art catalysts possessing Pt, CrOx, GaOx or VOx species. Identifying active sites and designing rationally heterogeneous catalysts are not inherently straightforward due to their complexity. Here, the authors reveal the nature of active sites for efficient C–H bond activation in C1-C4 alkanes over bare ZrO2 and provide fundamentals for controlling their concentration.
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影响因子:
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通讯作者:
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