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A density functional theory study of the effects of metal cations on the Brøsted acidity of H-ZSM-5

✍ Scribed by Nick O. Gonzales; Arup K. Chakraborty; Alexis T. Bell

Book ID
110383950
Publisher
Springer US
Year
1998
Tongue
English
Weight
455 KB
Volume
50
Category
Article
ISSN
1011-372X

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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