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129Xe n.m.r. study of VPI-5 and AIPO4-8 molecular sieves

✍ Scribed by Q.J. Chen; J. Fraissard; H. Cauffriez; J.L. Guth

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 470 KB
Volume: 11
Category: Article
ISSN: 0144-2449
DOI: 10.1016/s0144-2449(05)80001-6

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✦ Synopsis

Combined xenon-129 n.m.r. and X-ray diffraction techniques have been used to characterize two novel molecular sieves, VPI-5 and AIPO& By comparing the literature data, it can be concluded that VPI-5 contains generally not only extralarge pores, about 12.5 A in diameter, but also pores of about 10.7 A in diameter. These latter could be a very well-defined structural defect corresponding to 16 T-ring channels. Calcination of hydrated VPI-5 in a stream of air results in another molecular sieve: AlPOd-8. In contrast to VPI-5, AlPOd-contains no extralarge pores, but has pores about the same size of those of AlPOd-(-7.3 A).

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