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17 O Magic Angle Spinning NMR Studies of Brønsted Acid Sites in Zeolites HY and HZSM-5

✍ Scribed by Peng, Luming; Huo, Hua; Liu, Yun; Grey, Clare P.


Book ID
120340771
Publisher
American Chemical Society
Year
2007
Tongue
English
Weight
443 KB
Volume
129
Category
Article
ISSN
0002-7863

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1H solid-state NMR studies of the geomet
✍ Michael Hunger; Dieter Freude; Dieter Fenzke; Harry Pfeifer 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 419 KB

Broad-line 'H NMR and 'H MAS NMR were used to determine the geometry of the Bransted acidic sites in zeolites H-ZSM-5. The signals obtained correspond to bridging hydroxyl groups in Si-OH-Al arrangements with an H-Al distance of 0.246-0.252 nm. The concentration of hypothetical SiOHSi groups must be