In this paper, the interaction between simple alcohols(methanol to 1-butanol ) and a Fe–Ti mixed oxide was investigated. The reactivity of the mixed system was studied both at atmospheric pressure and in vacuum conditions and compared with that of the pure oxides (TiO2and Fe2O3). To understand the influence of the oxygen presence in the reaction mixture, the reactivity was investigated both in inert gas as well as in oxygen atmosphere. X-ray photoelectron spectroscopy(XPS.and quadrupole mass spectrometry have been used for the experiment in high vacuum, while Fourier transform infrared spectroscopy and QMS have been used for the experiment in rough vacuum and under atmospheric pressure conditions). The characterisation of the sample by means of XPS, X-ray diffraction and IR spectroscopy preceded the reactivity study. When compared with Fe2O3, the Fe–Ti–O mixed oxide seems to be less reactive with respect to the alcohols; the interaction between alcohol and surface is mainly molecular, as in the case of TiO2. Moreover, the oxidising power of the mixed oxide is lower than that of Fe2O3 (only traces of carbonic compounds are evident).
The reactivity of a Fe-Ti-O mixed oxide under different atmosphere: study of the interaction with simple alcohol molecules
GLISENTI, ANTONELLA
2000
Abstract
In this paper, the interaction between simple alcohols(methanol to 1-butanol ) and a Fe–Ti mixed oxide was investigated. The reactivity of the mixed system was studied both at atmospheric pressure and in vacuum conditions and compared with that of the pure oxides (TiO2and Fe2O3). To understand the influence of the oxygen presence in the reaction mixture, the reactivity was investigated both in inert gas as well as in oxygen atmosphere. X-ray photoelectron spectroscopy(XPS.and quadrupole mass spectrometry have been used for the experiment in high vacuum, while Fourier transform infrared spectroscopy and QMS have been used for the experiment in rough vacuum and under atmospheric pressure conditions). The characterisation of the sample by means of XPS, X-ray diffraction and IR spectroscopy preceded the reactivity study. When compared with Fe2O3, the Fe–Ti–O mixed oxide seems to be less reactive with respect to the alcohols; the interaction between alcohol and surface is mainly molecular, as in the case of TiO2. Moreover, the oxidising power of the mixed oxide is lower than that of Fe2O3 (only traces of carbonic compounds are evident).
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