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Mapping the oxygen structure of ?-Al2O3 by high-field solid-state NMR spectroscopy.


ABSTRACT: ?-Al2O3 is one of the most widely used catalysts or catalyst supports in numerous industrial catalytic processes. Understanding the structure of ?-Al2O3 is essential to tuning its physicochemical property, which still remains a great challenge. We report a strategy for the observation and determination of oxygen structure of ?-Al2O3 by using two-dimensional (2D) solid-state NMR spectroscopy at high field. 2D 17O double-quantum single-quantum homonuclear correlation NMR experiment is conducted at an ultra-high magnetic field of 35.2?T to reveal the spatial proximities between different oxygen species from the bulk to surface. Furthermore, 2D proton-detected 1H-17O heteronuclear correlation NMR experiments allow for a rapid identification and differentiation of surface hydroxyl groups and (sub-)surface oxygen species. Our experimental results demonstrate a non-random distribution of oxygen species in ?-Al2O3.

SUBMITTER: Wang Q 

PROVIDER: S-EPMC7367832 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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Mapping the oxygen structure of γ-Al<sub>2</sub>O<sub>3</sub> by high-field solid-state NMR spectroscopy.

Wang Qiang Q   Li Wenzheng W   Hung Ivan I   Mentink-Vigier Frederic F   Wang Xiaoling X   Qi Guodong G   Wang Xiang X   Gan Zhehong Z   Xu Jun J   Deng Feng F  

Nature communications 20200717 1


γ-Al<sub>2</sub>O<sub>3</sub> is one of the most widely used catalysts or catalyst supports in numerous industrial catalytic processes. Understanding the structure of γ-Al<sub>2</sub>O<sub>3</sub> is essential to tuning its physicochemical property, which still remains a great challenge. We report a strategy for the observation and determination of oxygen structure of γ-Al<sub>2</sub>O<sub>3</sub> by using two-dimensional (2D) solid-state NMR spectroscopy at high field. 2D <sup>17</sup>O double-  ...[more]

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