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- W4281289158 abstract "Five-coordinated Als (Al(V)) on the surface of aluminas play important roles when they are used as catalysts or catalyst supports. However, the comprehensive characterization and understanding of the intrinsic structural properties of the Al(V) remain a challenge, due to the very small amount in commonly used aluminas. Herein, the surface structures of γ-Al2O3 and Al(V)-rich Al2O3 nanosheets (Al2O3-NS) have been investigated and compared in detail by multinuclear high-field solid-state NMR. Thanks to the high resolution and sensitivity of ultra-high-field (up to 35.2 T) NMR, the arrangements of surface Als were clearly demonstrated, which are substantially different from the bulk phase in γ-Al2O3 due to the structure reconstruction. It reveals for the first time that most of the commonly observed Al(V)s tend to exist as aggregated states on the surface of γ-Al2O3, like those in amorphous Al2O3-NS liable to structure reconstruction. Our new insights into surface Al(V) species may help in understanding the structure-function relationship of alumina." @default.
- W4281289158 created "2022-05-24" @default.
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- W4281289158 date "2022-05-23" @default.
- W4281289158 modified "2023-10-15" @default.
- W4281289158 title "Nature of Five-Coordinated Al in γ-Al<sub>2</sub>O<sub>3</sub> Revealed by Ultra-High-Field Solid-State NMR" @default.
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- W4281289158 doi "https://doi.org/10.1021/acscentsci.1c01497" @default.
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