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Abstract

The behavior of benzene molecules in ZSM-5 has been studied in detail with the use of diffuse reflectance FT-IR spectroscopy. The infrared difference spectra indicate that benzene molecules have a high selectivity for adsorption first on the most energetic (Brönsted acid) ZSM-5 sites. The existence of at least two adsorbed benzene species has also been confirmed by infrared spectroscopy. Deuterated benzene (C₆D₆) species located at the ZSM-5 channels and channel intersections are characterized by the C-D stretching vibrations at 2284 and 2276 cm⁻¹, respectively. Since the high symmetry (D_6h) of the adsorbed benzene molecules is preserved, the framework of ZSM-5 may have been distorted. The distortion of the framework of ZSM-5 is also indicated by the red shift of the Si-O (or Al-O) asymmetric stretching vibrations (at ∼1215 cm⁻¹) when adsorbed benzene molecules are present.

Keywords

Benzene adsorption Zeolite ZSM-5 Diffuse reflectance infrared spectroscopy

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References

See for example: Csicsery

Sigmund M.

, Zeolites 4, 202 (1984).

Jentys

and Lercher

J. A

, in Zeolite as Catalysts, Sorbents and Detergent Builders, Karge

H. G.

and Weitkamp

, Eds. (Elsevier, New York, 1989), p. 585.

Busca

Zerlia

Lorenzelli

and Girelli

, J. Catal. 88, 131 (1984).

Coughlan

Carroll

W. M.

O'Malley

and Nunan

, J. Chem. Soc., Faraday Trans. I, 77, 3037 (1981).

Eckman

R. R.

and Vega

A. J

, J. Phys. Chem. 90, 4679 (1986).

Datka

, J. Chem. Soc., Faraday Trans. I, 77, 511 (1981).

Angell

C. L.

and Howell

M. V

, J. Colloid and Interface Sci. 28, 279 (1968).

Fitch

A. N.

Jobic

and Renouprez

, J. Phys. Chem. 90, 1311 (1986).

Jobic

Renouprez

Fitch

A. N.

and Lauter

H. J

, J. Chem. Soc., Faraday Trans. I, 83, 3199 (1987).

10.

Taylor

J. C.

, J. Chem. Soc., Chem. Commun., 1186 (1987).

11.

de Mallmann

and Barthomeuf

, Zeolites 8, 292 (1988).

12.

Fyfe

C. A.

Kennedy

G. J.

De Schutter

C. T.

and Kokotailo

G. T

, J. Chem. Soc., Chem. Commun., 541 (1984).

13.

Kokotailo

G. T.

Riekert

and Tissler

, in Zeolite as Catalysts, Sorbents and Detergent Builders, Karge

H. G.

and Weitkamp

, Eds. (Elsevier, New York, 1989), p. 843.

14.

Derouane

E. G.

, in Intercalation Chemistry, Whittingham

M. Stanley

and Jacobson

Allan J

, Eds. (Academic Press, New York, 1982), p. 101.

15.

Varsányi

and Szöke

, Vibrational Spectra of Benzene Derivatives (Academic Press, New York, 1969).

16.

Kiselev

A. V.

and Lygin

V. I

, Infrared Spectra of Surface Compounds (John Wiley & Sons, New York, 1975).

17.

Miecznikowski

and Hanuza

, Zeolites 7, 249 (1987).

18.

Förste

Germanus

Kärger

Pfeifer

Caro

Pilz

and Zikánová

, J. Chem. Soc., Faraday Trans. I, 83, 2301 (1987).

Benzene in Zeolite ZSM-5 Studied by Diffuse Reflectance Infrared Spectroscopy

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