Original scientific paper

FT-IR Spectroscopic Studies of Catalysts

J. Mink ; Institute of Isotopes of the Hungarian Academy of Sciences, H-1525 Budapest, P.O.B. 77, Hungary
T. Szilagyi ; Institute of Isotopes of the Hungarian Academy of Sciences, H-1525 Budapest, P.O.B. 77, Hungary

Abstract

The role of FTIR speetroscopy in catalytic studies is briefly
discussed and some typical examples are shown. IR spectra of
weakly bound hydrogen on PtjSi02 reveal surface heterogeneity;
The hydrogen concentration on the surface is described by a Temkin isotherm. Adsorption of unsaturated C6 ring compounds on hydrogen poor Pt/Si02 is essentially a self'-hydrogenation process resulting in the formation of cyclohexane and carbon deposit on the metal surface. Chemisorption of n-hexane and benzene on hydrogen-rlch
Ni/Si02 surface gives identical spectra under similar conditions.
The same phenomenon is established for n-butane and benzene
after chemisorption on the hydrogen-poor surface. The infrared
and Raman spectra of C.H6 on NijSi02 suggested a symmetry lowering somewhere between C6v and C3v because of the nonplanarity of C6H6and the site symmetry of the surface.

Keywords

Hrčak ID:

175994

URI

https://hrcak.srce.hr/175994

Publication date:

30.12.1988.

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