𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Limitation in the application of pyridine for quantitative studies of brönsted acidity in relatively aluminous zeolites

✍ Scribed by Marina A. Makarova; Khalid Karim; John Dwyer

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
287 KB
Volume
4
Category
Article
ISSN
0927-6513

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Activity–acidity relationship in zeolite
Activity–acidity relationship in zeolite Y: Part 3. Application of Brönsted type equations
✍ C Costa; J.M Lopes; F Lemos; F.Ramôa Ribeiro 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 86 KB

The relation between activity and acidity in a variety of Y zeolite catalysts for the transformation of small olefins: ethene, propene, 1-butene and iso-butene, is presented. The acid site distribution of these samples was estimated by temperature-programmed desorption of ammonia, by using a numeric

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

Infrared spectroscopic study of the bend
Infrared spectroscopic study of the bending modes of the Brønsted acidic sites in deuterated zeolites
✍ W.P.J.H. Jacobs; J.H.M.C. van Wolput; R.A. van Santen 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 425 KB

Deuteration of Bronsted acidic sites in zeolites gives observable infrared in-plane O-D bending modes. For zeolite Y and ZK-5, a maximum near 870 cm-' with a shoulder near 890 cm-' is observed. These signals arc related to, respectively, the highfrequency and the low-frequency stretching modes. Mord

Wide-line 1H NMR: a new application for
Wide-line 1H NMR: a new application for the study of Brönsted acidity strength of solids with HY zeolite as example
✍ Patrice Batamack; Claudine Dorémieux-Morin; Robert Vincent; Jacques Fraissard 📂 Article 📅 1991 🏛 Elsevier Science 🌐 English ⚖ 466 KB

The. fitting of 4 K 'H wide-line NMR spectra of Btinsted-acidic solid samples loaded with known amounts of water allows the determination of the concentration of the following species: H30+, H,O...HO, and of the remaining initial species: OH and H,O.