Infrared spectroscopic study of the bending modes of the bronsted acidic sites in deuterated zeolites

W.P.J.H. Jacobs, J.H.M.C. Wolput, van, R.A. Santen, van

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Abstract

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-1 with a shoulder near 890 cm-1 is observed. These signals are related to, respectively, the high-frequency and the low-frequency stretching modes. Mordenite, zeolite beta and ZSM-5 possess a single mode near 890 cm-1. The zeolite structure type and composition influences the position of the modes strongly. A large anharmonicity parameter, x(deltadelta)OD (-80 cm-1), is found due to Fermi resonance with the zeolite lattice modes
Original languageEnglish
Pages (from-to)32-37
JournalChemical Physics Letters
Volume210
Issue number1-3
DOIs
Publication statusPublished - 1993

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