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Probing Interactions of γ‐Alumina with Water via Multinuclear Solid‐State NMR Spectroscopy
Author(s) -
Shen Li,
Wang Yang,
Du JiaHuan,
Chen Kuizhi,
Lin Zhiye,
Wen Yujie,
Hung Ivan,
Gan Zhehong,
Peng Luming
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201901838
Subject(s) - nanorod , nuclear magnetic resonance spectroscopy , solid state nuclear magnetic resonance , catalysis , molecule , spectroscopy , chemistry , nmr spectra database , reactivity (psychology) , inorganic chemistry , chemical engineering , materials science , spectral line , nanotechnology , nuclear magnetic resonance , organic chemistry , medicine , physics , alternative medicine , quantum mechanics , astronomy , pathology , engineering
Abstract Interactions of γ‐alumina with water are important in controlling its structure and catalytic properties. We apply solid‐state multinuclear NMR spectroscopy to investigate these interactions by monitoring 1 H and 17 O spectra in real‐time. Surface‐selective detection is made possible by adsorbing 17 O‐enriched water on γ‐alumina nanorods. Structural evolution on the surface was selectively probed by 1 H/ 17 O double resonance NMR and 27 Al NMR at ultrahigh 35.2 T magnetic field. Formation of hydroxyl species on the surface of nanorods is rapid upon the exposure of water, which involves low coordinated aluminum ions with doubly bridging and isolated hydroxyl species being generated first. Fast exchange occurs between oxygen atoms in the water molecules and bare surface sites, indicating high reactivity of these oxygen species. These results provide new insights into the structure and dynamics on the surface of γ‐alumina and the methods applied here can be extended to study the interaction of other oxides with water.