An infrared study of structure relaxation in molecular sieves

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

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The lattice vibrations of the isostructural analogs AlPO4-5 and SSZ-24 were studied by IR spectroscopy. The vibrational modes were assigned based on theor. relaxed structures using a valence force field model to compute the lattice modes. The influence of the substitution of 2 Si atoms by 1 P and Al atom is discussed in relation to the exptl. spectra. The influence of protonation and exchangeable cations on lattice vibrations is demonstrated by in-situ IR transmission studies of the reammoniation of HY and the dehydration of NiY. The effect of substitution of the framework atoms or the extra-framework species on the lattice modes results in relaxation of the zeolitic structure, which can be monitored with IR spectroscopy. In the case of protonation of the lattice coupling between the zeolitic lattice modes and the bending modes of the acidic hydroxyls is obsd. [on SciFinder (R)]
Originele taal-2Engels
TitelProceedings from the Ninth International Zeolite Conference : Montreal, [from July 5th to July 10th], 1992
RedacteurenR. Balmoos, von, J.B. Higgins, M.M.J. Treacy
Pagina's529-536
StatusGepubliceerd - 1993
Evenementconference; International Zeolite Conference : Montreal, [from July 5th to July 10th], 1992 -
Duur: 1 jan 1993 → …

Congres

Congresconference; International Zeolite Conference : Montreal, [from July 5th to July 10th], 1992
Periode1/01/93 → …
AnderInternational Zeolite Conference : Montreal, [from July 5th to July 10th], 1992

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    Jacobs, W. P. J. H., Man, de, A. J. M., Wolput, van, J. H. M. C., & Santen, van, R. A. (1993). An infrared study of structure relaxation in molecular sieves. In R. Balmoos, von, J. B. Higgins, & M. M. J. Treacy (editors), Proceedings from the Ninth International Zeolite Conference : Montreal, [from July 5th to July 10th], 1992 (blz. 529-536)