| Summary: | 碩士 === 國立成功大學 === 化學系碩博士班 === 97 === Ethanolamine in alkaline solutions are often used as absorber to remove acid gas, such as CO2 and H2S in petrochemical plants. However, the evaporation of ethanolamine would cause environmental problems. The adsorption and photochemistry of ethanolamine on TiO2 have been investigated by Fourier-transformed infrared spectroscopy in an in-situ gas-solid interaction system. Since ethanolamine possesses the functional groups of NH2 and OH. The adsorption of n-propylamine and n-propanol on TiO2 is also studied. The comparison of the infrared spectra measured after the adsorption of these three molecules shows that ethanolamine is adsorbed molecularly and dissociatively to form NH2CH2CH2O(a) on TiO2 surface at 35 oC. Upon increasing the temperature to 300 oC, ethanolamine molecules are desorbed and the surface is covered with NH2CH2CH2O(a). NCO(a), HCOO(a), NO3-(a), HCONH(a), NH2CH2CHO(a), OCH2CH2OH(a), NH2CH2COO(a), CO2(g) are possibly generated in the UV irradiation of ethanolamine/TiO2 in the presence of O2. Approximately ~5 % ethanolamine molecules at high coverage decompose under 4 hr photoirradiation. Possible reaction pathways for the photoproducts are discussed.
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