4.6 Article

Probing Interactions of γ-Alumina with Water via Multinuclear Solid-State NMR Spectroscopy

期刊

CHEMCATCHEM
卷 12, 期 6, 页码 1569-1574

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201901838

关键词

gamma-Alumina; Water; Solid State NMR; Time-resolved; O-17

资金

  1. National Natural Science Foundation of China (NSFC) [21972066, 91745202, 21573103]
  2. NSFC -Royal Society Joint Program [21661130149]
  3. Royal Society
  4. Newton Fund
  5. National Science Foundation [NSF/DMR-1644779]
  6. State of Florida
  7. NSF [DMR-1039938, DMR-0603042]
  8. NIH [P41GM122698]

向作者/读者索取更多资源

Interactions of gamma-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 H-1 and O-17 spectra in real-time. Surface-selective detection is made possible by adsorbing O-17-enriched water on gamma-alumina nanorods. Structural evolution on the surface was selectively probed by H-1/O-17 double resonance NMR and Al-27 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 gamma-alumina and the methods applied here can be extended to study the interaction of other oxides with water.

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