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Solid‐State NMR Studies of the Structure and Reactivity of Metakaolinite
Author(s) -
Rocha João,
Klinowski Jacek
Publication year - 1990
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199005531
Subject(s) - hexacoordinate , calcination , solid state nuclear magnetic resonance , reactivity (psychology) , nuclear magnetic resonance spectroscopy , high resolution , tetra , chemistry , solid state , materials science , inorganic chemistry , organic chemistry , catalysis , nuclear magnetic resonance , medicinal chemistry , medicine , physics , alternative medicine , remote sensing , pathology , silicon , geology
Si atoms in various environments, as well as tetra‐, penta‐, and hexacoordinated AI atoms , have been observed in metakaolinite by high‐resolution solid‐state NMR spectroscopy. Their ratios depend upon the calcination temperature. Studies have shown that the most reactive metakaolinite (calcination temperature 480‐500 ° C) is associated with a minimum concentration of hexacoordinate and a maximum concentration of tetra‐ and pentacoordinate Al.