Fourier-transform infrared and inelastic neutron-scattering study of hy zeolites

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

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Abstract

A combination of FTi.r. and INS spectroscopy is used in a vibrational study of the bending and stretching vibrations of the acidic hydroxyl groups of Y zeolites. The influence of the number of acidic Bronsted sites and the Si/Al ratio is discussed. Out-of-plane hydroxyl bending modes are assigned to vibrations centered around 419 cm-1 and in-plane hydroxyl bending modes are assigned to vibrations centered around 1089 cm-1. Upon dealumination, these bands are shifted by approximately 30 cm-1 to lower values. The less intense bands at 319,470,565,765, and 1130 cm-1 are assigned to proton- coupled framework vibrations. Upon dealumination, the mode at 319 cm-1 is shifted to lower frequencies and the modes at 565 and 1130 cm-1 are shifted to higher frequencies
Original languageEnglish
Pages (from-to)315-319
JournalZeolites
Volume12
Issue number3
DOIs
Publication statusPublished - 1992

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