Brønsted acid strength of zeolites studied by 1H NMR: scaling, influence of defects
✍ Scribed by Lara Heeribout; Virginie Semmer; Patrice Batamack; Claudine Dorémieux-Morin; Jacques Fraissard
- Book ID
- 104431403
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 538 KB
- Volume
- 21
- Category
- Article
- ISSN
- 1387-1811
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📜 SIMILAR VOLUMES
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
H 2'AI and %i solid-state NMR was used to determine the geometry of the Brsnsted acid site in zeolites. The mean distance between acidic protons in bridging hydroxyl groups and the nearest framework Al atom is 2.38 ? 0.04 8, in zeolite H-Y and 2.48 2 0.04 A in H-ZSM-5. The quadrupole frequency of fr