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

Qiang Wang, Wenzheng Li, Ivan Hung, Frederic Mentink-Vigier, Xiaoling Wang, Guodong Qi, Xiang Wang, Zhehong Gan, Jun Xu () and Feng Deng
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Qiang Wang: Chinese Academy of Sciences
Wenzheng Li: Chinese Academy of Sciences
Ivan Hung: National High Magnetic Field Laboratory
Frederic Mentink-Vigier: National High Magnetic Field Laboratory
Xiaoling Wang: National High Magnetic Field Laboratory
Guodong Qi: Chinese Academy of Sciences
Xiang Wang: Chinese Academy of Sciences
Zhehong Gan: National High Magnetic Field Laboratory
Jun Xu: Chinese Academy of Sciences
Feng Deng: Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract γ-Al2O3 is one of the most widely used catalysts or catalyst supports in numerous industrial catalytic processes. Understanding the structure of γ-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 γ-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 γ-Al2O3.

Date: 2020
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DOI: 10.1038/s41467-020-17470-4

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