(湖南科技大学 化学化工学院，湘潭 411201)
摘 要: 采用溶胶−凝胶法制备N-Fe/TiO2催化剂；用X射线衍射、扫描电镜及荧光光谱等方法对其进行表征；以低级醇类光催化消除反应为模式反应评价催化剂在紫外光照下的光催化性能。结果表明：催化剂制备的最佳条件为活化温度400 ℃、活化时间3 h、铁掺杂量0.10%~0.15%(摩尔分数)、氮掺杂量10%(摩尔分数)。0.15 g催化剂可将初始浓度均为8.3 g/m3、流速为7 mL/min的甲醇、丙醇和丁醇及初始浓度均为8.3 g/m3、流速为5 mL/min的乙醇完全消除，且催化剂连续反应252 h没有失去活性。在N-Fe/TiO2催化剂上，甲醇和乙醇的光催化消除反应是一级反应，其表观活化能为在实验温度范围内与温度无关的常数。
关键字: N-Fe/TiO2；光催化消除；低级醇类
N-Fe/TiO2 catalyst for elimination of light alcohols
（School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China）
Abstract:The N-Fe/TiO2 catalysts were prepared by sol-gel method and characterized by X-ray diffractometry, scanning electron microscopy and fluorescence emission spectroscopy. The photocatalytic eliminations of the light alcohol were used as model reactions to evaluate the photocatalytic activity of the catalysts under ultraviolet light irradiation. The results show that an optimal program of catalyst preparation is that the activation temperature is 400 ℃, activation time is 3 h, the amount of iron-doped is 0.10%−0.15% (mole fraction) and the amount of nitrogen-doped is 10% (mole fraction). Methanol, propanol and b, utanol with the initial concentration of 8.3 g/m3 and the flow rate of 7.0 mL/min, the ethanol with the initial concentration of 8.3 g/m3 and the flow rate of 5 mL/min can be completely mineralized using 0.15 g N-Fe/TiO2 as the catalyst prepared by the above optimal program. The activity of the catalyst is stable over 252 h continuous reaction. The kinetics of the photo-catalytic methanol and ethanol elimination follows the first-order reaction. The apparent activation energy is constant in the experimental temperature range.
Key words: N-Fe/TiO2; photocatalytic elimination; light alcohols
