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The effect of sodium poisoning on acid sites in ZSM-22 zeolites

✍ Scribed by R.B. Borade; A. Adnot; S. Kaliaguine

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
492 KB
Volume
12
Category
Article
ISSN
0144-2449

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1H solid-state NMR studies of the geomet
1H solid-state NMR studies of the geometry of BrΓΈnsted acid sites in zeolites H-ZSM-5
✍ Michael Hunger; Dieter Freude; Dieter Fenzke; Harry Pfeifer πŸ“‚ Article πŸ“… 1992 πŸ› Elsevier Science 🌐 English βš– 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