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A vibrational study of the OH and OD bending modes of the Brönsted acid sites in zeolites

✍ Scribed by W.P.J.H Jacobs; J.H.M.C van Wolput; R.A van Santen; H Jobic


Book ID
107894587
Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
822 KB
Volume
14
Category
Article
ISSN
0144-2449

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Infrared spectroscopic study of the bend
✍ 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

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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