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27 Al MAS (magic angle spinning) and 3Q (triple quantum) MAS NMR (nuclear magnetic resonance) at a very high magnetic field (16 T, 700MHz for 1 H) enabled us to detect all the Al species on a series of modified Y zeolites. In a USY (ultra stable Y) zeolite after steaming, extra-framework Al species with various environments were detected, while only framework Al (IV) was observed in the...
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