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Solid-state NMR studies of the aluminophosphate molecular sieve VPI-5

✍ Scribed by Heyong He; Jacek Klinowski

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
558 KB
Volume
30
Category
Article
ISSN
0920-5861

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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

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Silicon-free and silicon-rich large-pore aluminophospate VPI-5, synthesized with various contents of AlPO-H3 Ε½ . Ε½ . Ε½ . impurity, was studied by Bloch decay BD and cross polarization CP NMR under magic angle spinning MAS . The 1 H β„’ 31 P CP peaks were considerably stronger from AlPO-H3 than from VP

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Hydrated aluminophosphate molecular sieve VPI-5 has been studied by "P solid-state NMR with variable-speed magic-angle spinning, Cross-polarization and two-dimensional spin-diffusion spectra were used to assign NMR signals to particular phosphorus sites in the structure in the P63 space group. The a