Abstract
The adsorption of aniline and t-butylamine on Al 2O 3, Fe 2O 3, SiO 2, MgO, and CaO at the solid/vapour interfaces has been studied by infrared spectroscopy and temperature-programmed desorption (TPD). At beam temperature the surface complexes formed are the same as those discussed earlier in the case of other amines: there is hydrogen bonding and dissociative adsorption on SiO 2, and formation of coordination bonds between amine molecules and Lewis-acidic surface sites on the other oxides. With increasing temperature during the TPD runs, in the case of aniline only aniline itself desorbs, whereas when t-butylamine is used, in addition to the unchanged amine, isobutene and NH 3 can be detected as desorption products, indicating the occurrence of CN bond breakage. With both amines oxidation reactions take place on the surface of Fe 2O 3.
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