期刊
CATALYSIS LETTERS
卷 132, 期 1-2, 页码 133-137出版社
SPRINGER
DOI: 10.1007/s10562-009-0078-9
关键词
Zeolites; Aluminum NMR spectroscopy; Quadrupolar coupling constants; Cation exchange
资金
- NSF [DUE 0310554]
- Penn State Berks
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 Al-27 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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