N-Fe/TiO_2对低级醇类的光催化消除性能及动力学  

Photo-catalytic performance and kinetics of N-Fe/TiO_2 catalyst for elimination of light alcohols

作　　者：邓谦[1] 张鹏[1] 韦宗元[1] 严语波[1] 吕桃林[1] 彭振山[1] 蔡铁军[1] 

机构地区：[1]湖南科技大学化学化工学院,湘潭411201

出　　处：《中国有色金属学报》2011年第7期1763-1769,共7页The Chinese Journal of Nonferrous Metals

基　　金：理论化学与分子模拟省部共建教育部重点实验室基金资助项目(教技函[2008]153号)

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。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 butanol 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.

关 键 词：N-Fe/TiO2 光催化消除 低级醇类 

分 类 号：O643[理学—物理化学]