High-resolution 27AI NMR spectroscopy of the aluminophosphate molecular sieve VPI-5
β Scribed by Wu, Y.; Chmelka, B. F.; Pines, A.; Davis, M. E.; Grobet, P. J.; Jacobs, P. A.
- Book ID
- 109764479
- Publisher
- Nature Publishing Group
- Year
- 1990
- Tongue
- English
- Weight
- 335 KB
- Volume
- 346
- Category
- Article
- ISSN
- 0028-0836
- DOI
- 10.1038/346550a0
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π SIMILAR VOLUMES
Two-dimensional multiquantum MAS-NMR spectroscopy (2D-MQ) has been applied to the discrimination of the different 27A1 sites in several aluminophosphate molecular sieves. It is shown that a new quintuple-quantum MAS-NMR method (2D-5Q) gives an extraordinary improved resolution compared to the DOR or
The preparation of partially hydrated VPI-5, in which water molecules are strongly bonded to l/3 of framework Al atoms but there is no intracrystalline water, can be readily monitored in situ by rH NMR when fully hydrated samples are heated inside an NMR rotor. \*'Al and 3'P MAS NMR spectra have als
Solid-state 27AI NMR spectra of seve ra l aluminophosphate molecular sieves have been recorded with conventional magic-angle spinning (MAS), double-rotation (DOR) and quadrupole nutation with fast MAS. Enhanced resolution was obtained in the quadrupole nutation experiment at certain radiofrcqucncy p