Correlations between 27Al magic-angle spinning nuclear magnetic resonance spectra and the coordination geometry of framework aluminates
β Scribed by M.T. Weller; M.E. Brenchley; D.C. Apperley; N.A. Davies
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 339 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0926-2040
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Wide-band (1 MHz) 27Ai magic-angle spinning nuclear magnetic resonance (MAS NMR) spectra were recorded for zeolite Y &/Al \_ 2.7) and high-silica (%/Al u 3.8) FAU, EMT and mixed FAU-EMT structure-type zeolites synthesized using 15crown-5 and/or 18-crown-6 ethers as templating agents. Spinning sideba
27Al nuclear magnetic resonance spectra of polycrystalline aluminium borate 9Al2O3.2B2O3 have been measured in double rotation at 11.7 and 7.0 T and high-speed magic-angle spinning at 7.0, 9.4, 11.7, 14.1 and 17.6 T. Spinning sidebands from the satellite transitions were observed at 7.0 and 14.1 T.
27Al magic-angle spinning nuclear magnetic resonance satellite transition spectroscopy at 78 MHz has been applied to determine (true) chemical shift and quadrupole coupling parameters of glasses in the system K2O-Al2O3-SiO2 with 60-80 mol% SiO2 and K2O concentrations between 0 and 24 mol%. The powde