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Applications of 27Al multiple quantum magic angle spinning NMR to aluminophosphate molecular sieves

โœ Scribed by Philippe R. Bodart; Jean paul Amoureux; Marek Pruski; Alain Bailly; Christian Fernandez


Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
102 KB
Volume
37
Category
Article
ISSN
0749-1581

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โœฆ Synopsis


The advantages and drawbacks of various techniques that utilize multiple quantum magic angle spinning (MQMAS) NMR for studying molecular sieves and related materials are reviewed. The techniques include z-filtered MQMAS with rotor synchronization, MQMAS with cross-polarization and MQMAS with REDOR. Several methods of recovering quantitative intensities in MQMAS spectra are discussed. Examples of applications include studies of various types of aluminophosphate.


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โœ P. Lentz; A. P. Carvalho; L. Delevoye; C. Fernandez; J.-P. Amoureux; J. B. Nagy ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 116 KB ๐Ÿ‘ 2 views

29 Si magic angle spinning (MAS) NMR, 27 Al MAS NMR and 27 Al triple-quantum MAS NMR were used to study the dealumination of offretite occurring during hydrothermal treatment. Deformed tetrahedral ( Si-O-) 3 Al-OH species and two octahedral extra-framework species are formed during the course of th