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Fourier transform infrared and inelastic neutron scattering study of HY zeolites

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

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
461 KB
Volume
12
Category
Article
ISSN
0144-2449

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✦ Synopsis

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 Br6nsted sites and the Si/AI 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 protoncoupled framework vibrations. Upon dealumination, the mode at 319 cm -~ is shifted to lower frequencies and the modes at 565 and 1130 cm -~ are shifted to higher frequencies.

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