𝔖 Bobbio Scriptorium
✦   LIBER   ✦

NMR studies of the Brønsted acidity of solids. Application to superacidic solids

✍ Scribed by Virginie Semmer; Patrice Batamack; Claudine Dorémieux-Morin; Jacques Fraissard

Book ID
110385531
Publisher
Springer
Year
1998
Tongue
English
Weight
175 KB
Volume
6
Category
Article
ISSN
1022-5528

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Solid-state NMR studies of the geometry
Solid-state NMR studies of the geometry of brønsted acid sites in zeolitic catalysts
✍ Dieter Freude; Jacek Klinowski; Halimaton Hamdan 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 673 KB

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

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