FTIR study of adsorption and reactions of methylamine on powdered TiO2

The adsorption, thermal reactions, and photochemistry of methylamine on TiO 2 have been investigated using infrared spectroscopy. It is found that meth ylamine is adsorbed molecularly on TiO2 at 35 degreesC. Hydrogen exchange o ccurs between the NH2 group of adsorbed methylamine and surface OH groups. Thermal reactivity of methylamine is enhanced in the presence of O-2, produ cing NH3(g), CO2(g), and other oxygenated compounds. UV irradiation of TiO2 in the presence of methylamine and oxygen generates NH3(g), CO2(g), H2O(g) ; NCO(a), and HCOO(a). Possible reaction steps for the photoproducts are di scussed.