In situ FT-IR Study of Photocatalytic NO and CH4Reaction on Photocatalysts

• Main Authors: Yi-Ting Wu, 吳怡亭
• Other Authors: 吳紀聖
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/22193571112414460044

碩士 === 臺灣大學 === 化學工程學研究所 === 95 === NOx is a well-known air pollutant. We propose to remediate NOx by photo catalytic reduction at low temperature (<100℃). In situ FTIR was used to observe reaction intermediates and to explore possible mechanisms. The thermal-hydrolysis method was used to prepare TiO2 and 1wt% Pt-TiO2 photocatalysts. UV light was used as light source. The reactants, CH4 and NO, are adsorbed on the photocatalyst (TiO2 or 1wt% Pt-TiO2), the reaction was performed at three temperatures (25, 50 and 100℃). Under light irradiation, most of the CH4 is converted to formic acid and CO2. When NO is adsorbed on the photocatalyst, it becomes NO2, bidentate nitrites and monodentate nitrate. After light irradiation, bidentate nitrite disappears, while bidentate nitrate, monodentate nitrate and isocyanate are generated. Literatures suggest that NCO is the main intermediate in the selective catalytic reduction (SCR) process. In addition, NH2 was also observed in this experiment. Finally it is concluded that NO can be reduced to N2 by low temperature SCR under light irradiation.