Synthesis and characterisation of mesoporous aluminophosphates containing boronElectronic supplementary information (ESI) available: thermogravimetric analysis of mesostructured BAPO,XRD patterns of Hex-2 BAPO,27Al MAS NMR spectra of intermediate products formed during the synthesis of Hex-1 BAPO, 11B MAS NMR spectra of Hex-2 BAPO. See http://www.rsc.org/suppdata/jm/b1/b106911j/

2002 ◽  
Vol 12 (4) ◽  
pp. 1079-1085 ◽  
Author(s):  
Yaroslav Z. Khimyak ◽  
Jacek Klinowski
Keyword(s):  
Thermogravimetric Analysis ◽  
Nmr Spectra ◽  
Mas Nmr ◽  
Supplementary Information ◽  
Intermediate Products ◽  
27Al Mas Nmr ◽  
Xrd Patterns ◽  
Mesoporous Aluminophosphates

29Si and 27Al MAS NMR spectra are affected by alkali metal cluster formation in zeolite LTA

2000 ◽  
pp. 55-56 ◽  
Author(s):  
Kelly L. Moran ◽  
Ray Dupree ◽  
Peter D. Barker ◽  
Jennifer E. Readman ◽  
Peter P. Edwards ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Nmr Spectra ◽  
Metal Cluster ◽  
Cluster Formation ◽  
Mas Nmr ◽  
27Al Mas Nmr ◽  
Zeolite Lta

27Al MAS-NMR spectra of alumina aerogels

1993 ◽  
Vol 8 (9) ◽  
pp. 2109-2111 ◽  
Author(s):  
Yasuyuki Mizushima ◽  
Makoto Hori ◽  
Minoru Sasaki
Keyword(s):  
Nmr Spectra ◽  
Mas Nmr ◽  
The Other ◽  
Alumina Aerogel ◽  
Other Hand ◽  
27Al Mas Nmr ◽  
Alumina Aerogels ◽  
Lower Temperature

The 27Al MAS-NMR spectra of alumina aerogels were determined. The spectra showed different profiles according to the supercritical methods used during drying. The alumina aerogel supercritically dried in a CO2 extractor (80 °C, 15.7 MPa) displayed a pentahedral-coordinated aluminum structure. On the other hand, the alumina aerogel supercritically dried in an autoclave (270 °C, 26.5 MPa) revealed no pentahedral-coordinated aluminum structure. The absence of pentahedral-coordinated aluminum was one factor for the lower temperature of transformation from the γ to the θ phase.

23Na 2D 3QMAS NMR and 29Si, 27Al MAS NMR investigation of Laponite and synthetic saponites of variable interlayer charge

Clay Minerals ◽  
2003 ◽  
Vol 38 (1) ◽  
pp. 63-69 ◽  
Author(s):  
L. Delevoye ◽  
J . -L. Robert ◽  
J . Grandjean
Keyword(s):  
High Resolution ◽  
Chemical Shift ◽  
Chemical Analysis ◽  
Nmr Spectra ◽  
Mas Nmr ◽  
High Resolution Spectrum ◽  
Isotropic Chemical Shift ◽  
Quadrupolar Interaction ◽  
27Al Mas Nmr ◽  
Good Agreement

Abstract29Si, 27Al MAS NMR is used to characterize Laponite RD and synthetic saponites of variable interlayer charge. The Si/Al ratios are in good agreement with the calculated charge from chemical analysis except for the lowest-charged saponite. In contrast to the 29Si MAS NMR spectra in which resolved signals are detected, the 27Al MAS NMR spectra show one signal whose linewidth increases with the clay charge. The water content of the clay samples was obtained from 1H MAS NMR.The 2D MQMAS NMR technique is required to obtain a high-resolution spectrum of nuclei with strong quadrupolar interaction. This method was applied to the 23Na nucleus of clay counterions and to the 27Al structural nucleus. One well-defined 23Na NMR signal is observed for all the clays studied except the highest-charged saponite. Possible explanations for this different behaviour are discussed. The calculated isotropic chemical shift evolves progressively with the clay charge whereas the deduced quadrupolar interaction does not change significantly. The 27Al 2D 3QMAS technique was not able to resolve more than one signal.

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