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Thermal Desorption and Infrared Studies of Primary Aliphatic Amines adsorbed on Haematite (α-Fe2O3)

DOI: 10.1039/f19868202505

Source and publish data:

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 2505 - 2514 (1986)

Update date:2022-08-24

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Authors:

Marx, UteMarx, Ute

Sokoll, RolfSokoll, Rolf

Hobert, HartmutHobert, Hartmut

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Article abstract of DOI:10.1039/f19868202505

The adsorption of n-octadecylamine on α-Fe2O3 at the solid/liquid interface, and of n-butylamine at the solid/liquid and solid/vapour interfaces has been studied by infrared spectroscopy.To obtain further information about the nature of desorbing products, temperature-programmed desorption experiments were made with n-butylamine-α-Fe2O3 adsorbates.No difference could be detected by i.r. spectroscopy between the nature of adsorbates formed under the various mentioned conditions.Adsorption of n-octadecylamine and n-butylamine on α-Fe2O3 mainly involves coordinative interactions between amine and Lewis-acidic surface sites (Fe(3+) cations).Furthermore, hydrogen bonds are formed between surface hydroxy groups and adsorbed amine molecules. n-Butylamine adsorbed on α-Fe2O3 gave four different desorption peaks (I-IV) which are formed by n-butylamine (I:423 K), butyronitrile (II:530 K), CO2 (III:630K) and H2O (IV:713 K).Desorption of CO2 and H2O is caused by the oxidation of amine molecules strongly adsorbed on two different types of coordination sites.

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