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
โฆ LIBER โฆ
Applications of 27Al multiple quantum magic angle spinning NMR to aluminophosphate molecular sieves
โ 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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โฆ 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.
๐ SIMILAR VOLUMES
Characterization of offretite during hyd
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โ 116 KB
๐ 2 views
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