Abstract
Adsorption of allylamine and benzylamine on SiO 2, Al 2O 3, Fe 2O 3, MgO, and CaO at the solid/vapor interface has been studied by infrared spectroscopy and temperature-programmed desorption. At beam temperature similar surface complexes are formed as in previous work with other amines. Compared to saturated amines, more reactions take place with increasing temperature during the TPD runs; these include dehydrogenation to the corresponding nitriles and CN bond breakage. Besides gaseous NH 3, in the latter reaction allyl and benzyl species, respectively, that undergo several further chemical transformations on the oxide surfaces are formed. Allylamine/MgO and allylamine/CaO are the only systems (of all investigated amine/oxide systems) in which surface reactions begin already at room temperature.
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