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Abstract
The effects of cations on the local electromagnetic environments of catalytic sites in Y-zeolites are studied as a function of cation type and concentration. Quadrupolar coupling parameters measurable using 27Al MAS NMR at multiple field strengths, provide a window to study aluminum’s local electronic structure. Quadrupolar parameters calculated for framework tetrahedral aluminum are related to cation concentration and Bronsted acidity for potassium-, zinc-, and lanthanum-exchanged NH4NaY and USY zeolites.
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