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The determination of the average 27Al31P distance in aluminophosphate molecular sieves with SEDOR NMR

✍ Scribed by E.R.H. van Eck; W.S. Veeman

Book ID: 103963656
Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 331 KB
Volume: 1
Category: Article
ISSN: 0926-2040
DOI: 10.1016/0926-2040(92)90003-r

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✦ Synopsis

The average 27Al-31P distances in an aluminophosphate, AlPO4-5, and in a silicoaluminophosphate, SAPO-11, were determined by using Spin Echo DOuble Resonance (SEDOR). A calculated SEDOR curve was fitted to the data in order to obtain the dipolar coupling constant. The tetrahedral surrounding of 27Al by four 31P atoms in the second coordination sphere was taken into account in the calculation of the theoretical SEDOR curve. The average 27Al-31P distances obtained by using this technique proved to be in good agreement with X-ray diffraction data.

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