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Quantum calculations of Brønsted acidity and 1H NMR chemical shift in zeolites

✍ Scribed by Ming Hsiang Feng; Kuei Jung Chao

Book ID
113258838
Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
582 KB
Volume
364
Category
Article
ISSN
0166-1280

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📜 SIMILAR VOLUMES

1H solid-state NMR studies of the geomet
1H solid-state NMR studies of the geometry of Brønsted acid sites in zeolites H-ZSM-5
✍ 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