Journal of the Korean Magnetic Resonance Society (한국자기공명학회논문지)
- Volume 4 Issue 1
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- Pages.12-18
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- 2000
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- 1226-6531(pISSN)
Characterization of Metakaolinite with Multiple Quantum MAS NMR
- Han, Oc-Hee (Magnetic Resonance Team, Division of Analysis and Measurement, Korea Basic Science Institute) ;
- Stefan Steuernagel (Bruker Analytik GmbH, Silberstreifen)
- Published : 2000.02.01
Abstract
Metakaolinite produced by thermal transformation from kaolinite was studied by 27Al multiple quantum magic angel spinning (MQMAS) NMR technique in addition to 1-dimensional 27Al and 29Si MAS NMR. Our results confirm that 4-, 5-, 6- coordinated aluminum sites co-exit with some distribution of isotropic chemical shifts. This is consistent with amorphous character of metakaolinite observed with X-ray diffraction. In addition, characterization with MQMAS is briefly discussed in comparison with other NMR techniques to identify different aluminum sites especially when peaks are severely overlapped in 1-dimensional 27Al MAS NMR spectra.
Keywords